NOVELTY - Polygeneration treatment of garbage or biomass comprises feeding garbage, biomass or coal into circular gasification furnace, drying, pyrolyzing, reducing and oxidizing carbon residue; feeding oxidant and gasification agent; returning mixed gas material into oxidizing area and circularly treating; cracking hydrocarbon and tar gases, defusing smoke, decomposing highly toxic dioxin and performing water-gas reaction; drying, discharging burnt slag, returning mixed gas into solid raw material, drying, reducing, pyrolyzing and circularly treating; and extracting and post-treating.    USE - Method for polygeneration treatment of garbage or biomass (claimed) for generating clean energy source including fuel and industrial coal gas, and chemical raw materials including methane, dimethyl ether, methanol and hydrogen products. The slag produced in the method is used for generating building material or fertilizer; and the excess heat is used for generating power or providing heat.    ADVANTAGE - The method performs environment friendly city garbage treatment and protects biological environment. The system has complete solid raw material gasification, no pollutant discharge, low waste gas exhaust, easy clarification treatment, adequate device size and easy application.    DETAILED DESCRIPTION - Polygeneration treatment of garbage or biomass comprises:    (A) feeding garbage, biomass or coal into circular gasification furnace, drying, pyrolyzing, reducing and oxidizing carbon residue;    (B) feeding oxidant and gasification agent including oxygen, air or steam into furnace, where oxidizing area temperature is at 1000-1600 degrees C, reducing area temperature is at 700-1000 degrees C, pyrolysis area temperature is at 500-800 degrees C, drying area temperature is at not less than 1200 degrees C, and operating pressure of smoke/gas/steam outlet and drying area is 20-30 Pa negative pressure;    (C) returning mixed gas material comprising smoke, steam, hydrogen, carbon monoxide, carbon dioxide, methane, hydrocarbon gas and tar gas in furnace into oxidizing area and circularly treating;    (D) cracking hydrocarbon and tar gases using heat (1000-1600 degrees C) produced by burning carbon in oxidizing area, defusing smoke, decomposing highly toxic dioxin, and carrying out water-gas reaction, where heat (700-1000 degrees C) produced in reducing area reduces carbon dioxide into carbon monoxide and heat (500-800 degrees C) in pyrolysis area evaporates solid raw material;    (E) drying raw material in furnace using reacted residue heat and using dried-out steam as gasification agent for reaction, where gas phase circular reaction converts solid raw material into synthesized gas with rich hydrogen or methane;    (F) discharging burnt slag into water sealed type slag tank, introducing oxygen or air into air chamber of gas phase circular gasification furnace and into oxidizing area or spraying steam in oxidizing area, or returning mixed gas of oxidized heat, carbon dioxide and carbon monoxide with pyrolyzed hydrogen, methane, hydrocarbon gas, tar gas, smoke and steam into solid raw material, leading to drying area from oxidizing area, reducing area and pyrolysis area, and returning to oxidizing area to perform gas phase circular treatment and generate synthesized gas with rich hydrogen using hydrogen and carbon monoxide or synthesized gas with rich methane using methane, carbon monoxide and hydrogen; and    (G) extracting synthesized gas with rich hydrogen or methane and post-treating.    The post treatment comprises:    (A) directly transporting synthesized gas with rich hydrogen or methane into boiler and kiln, introducing air or oxygen and burning;    (B) dedusting or clarifying synthesized gas with rich hydrogen or methane, and transporting into boiler or kiln to be used as fuel;    (C) cooling synthesized gas with rich hydrogen or methane, dedusting or clarifying, compressing, storing in gas tank and using as industrial coal gas;    (D) cooling synthesized gas with rich hydrogen, dedusting or clarifying, transporting into methane or dimethyl ether synthesizing reactor, and catalytically synthesizing methane product or dimethyl ether product;    (E) cooling synthesized gas with rich hydrogen, dedusting or clarifying, transporting into carbon monoxide conversion reactor, reacting through steam and carbon monoxide so that the mole ratio of hydrogen to carbon monoxide in synthesized gas is 2:1, and transporting in carbon dioxide absorption tower;    (F) removing carbon dioxide using potassium carbonate solution, transporting synthesized gas with rich hydrogen into methane or dimethyl ether synthesizing reactor, and catalytically synthesizing methane or dimethyl ether product;    (G) cooling synthesized gas with rich hydrogen or methane, dedusting or clarifying, transporting into electric catalytic synthesizing reactor and catalyzing at 120-450 degrees C under 0-1 MPa to synthesize into dimethyl ether or methanol product;    (H) cooling synthesized gas with rich hydrogen, dedusting or clarifying, transporting into hydrogenation mixer such that the mole ratio of hydrogen to carbon monoxide is 2:1, transmitting synthesized gas with rich hydrogen into methane or dimethyl ether synthesizing reactor to synthesize methane or dimethyl ether product; and    (I) cooling synthesized gas with rich hydrogen, dedusting or clarifying, transporting into carbon monoxide conversion reactor, reacting using steam and carbon monoxide to generate carbon dioxide and hydrogen, and transporting synthesized gas with carbon dioxide and hydrogen into voltage-changing separation/clarification device to remove carbon dioxide, nitrogen and impurity to generate hydrogen product.    INDEPENDENT CLAIMS are included for:    (1) a garbage biomass gasification and liquification treatment system; and    (2) a garbage biomass gasification and liquification treatment device.