NOVELTY - Co-producing urea and methanol by processing high concentration ammonia-nitrogen and chemical oxygen demand (COD) sewage, comprises mixing e.g. high-concentration ammonia-nitrogen and fine coal, grinding to prepare weak alkaline multi-coal slurry, mixing with oxygen, atomizing, performing gasification process, cracking, performing oxidization reaction to produce gas, converting water coal gas into hydrogen and carbon dioxide, purifying, separating, synthesizing urea, partially converting water coal gas, purifying, passing into an methanol synthesizing device, and producing methanol.    USE - The method is useful for co-producing urea and methanol by processing high concentration ammonia-nitrogen and chemical oxygen demand sewage.    ADVANTAGE - The method increases production without increasing consumption of raw materials, converts harmful substances into useful fertilizer raw material gas, and does not produce secondary pollution.    DETAILED DESCRIPTION - Co-producing urea and methanol by processing high concentration ammonia-nitrogen and chemical oxygen demand (COD)sewage, comprises (a) mixing high-concentration ammonia-nitrogen, COD sewage, fine coal and coal slurry additive, adding into a coal mill, and grinding to prepare weak alkaline multi-coal slurry with a concentration of 55-70%; (b) mixing multi-coal slurry and oxygen, atomizing in an atomizing nozzle, conveying into a coal slurry gasifier, performing gasification process at 1300-1500 degrees C under pressure of 2-8MPa, cracking, performing oxidization reaction to produce gas, converting ammonia-nitrogen and COD to generate carbon monoxide, carbon dioxide, hydrogen and nitrogen, washing water coal gas with water, cooling and de-dusting; and (c) processing the whole water coal gas by low temperature shift process: (ci) converting water coal gas into hydrogen and carbon dioxide, purifying the shift gas, and separating into carbon dioxide, hydrogen and nitrogen, synthesizing urea by combining hydrogen, nitrogen (synthetic ammonia), ammonia and carbon dioxide; and (cii) partially converting the water coal gas, controlling the proportion of carbon monoxide, carbon dioxide and hydrogen, purifying, passing into a methanol synthesizing device, and producing methanol.