NOVELTY - Preparing industrial gas or civil gas with raw materials of rubbish and biomass through pyrolysis, comprises: (a) preparing raw materials: squeezing and cutting the rubbish with a squeezing cutting machine, dry pressing the external water, cutting to blocks convenient for baking, baking and grinding to particles of less than 3 mm, storing in a material cabin of the pyrolysis furnace; (b) collecting pyrolysis gas and using heat energy: (i) collecting cracking gas; and (ii) using heat energy; and (c) synchronously using after heat.    USE - The process is useful for preparing industrial gas or civil gas with raw materials of rubbish and biomass through pyrolysis (claimed).    ADVANTAGE - In utilizing the process, the heat energy is fully used; and the after gas emitted after cracking does not pollute the environment; thus, the purpose of energy saving and emission reducing is achieved.    DETAILED DESCRIPTION - Preparing industrial gas or civil gas with raw materials of rubbish and biomass through pyrolysis, comprises: (a) preparing raw materials: squeezing and cutting the rubbish with a squeezing cutting machine, dry pressing the external water, cutting to blocks convenient for baking, baking and grinding to particles of less than 3 mm, storing in a material cabin of the pyrolysis furnace; (b) collecting pyrolysis gas and using heat energy: (i) collecting cracking gas; where the raw material particles are applied to pyrolysis in the pyrolysis stove (1) with high temperature gas through a high temperature heat exchanger (15); the cracking gas is sent to a coal gas dust removal tower (2) via an outlet in order to remove the dust, and then is sent to a air cabinet; and it becomes synthesized available gas after the stages of compression and purification; and (ii) using heat energy; where the raw material carbon after pyrolysis drops at the bottom of the pyrolysis stove (1); the carbon materials are drawn to a carbon ash cabinet (17) and is added to a fuel gas furnace (3) via a feeding mechanism; the high temperature gas doped with dust is formed after combustion in the fuel gas furnace (3); the high temperature gas doped with dust is sent to a cyclone separator (4) to separate the dust; the slag which has not combusted and dust are collected by the slag charge collecting devices arranged on the fuel gas furnace (3) and the cyclone separator (4); and the separated high temperature gas is sent to the pyrolysis stove (1) as raw material supply for pyrolysis; and (c) synchronously using after heat; where the provided heat of the fuel gas furnace (3) and the high temperature gas after pyrolysis carbon material separation are cooled from bottom to top via the raw material layer; the low temperature gas is introduced into an air heater (6) through the outlet at the upper part of the pyrolysis stove (1), and exchanges heat with the air sent by an air blower (5); the heated air is sent to the fuel gas furnace (3) via a nozzle; the residual gas after heat exchange is led to a water film dust remover (9) for dust removal via a raw materials drier (7) and a fuel gas introduction machine (8); and it is discharged via a chimney (10).    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the system used in preparing industrial gas or civil gas with raw materials of rubbish and biomass through pyrolysis.    Pyrolysis stove (1)    Coal gas dust removal tower (2)    Fuel gas furnace (3)    Cyclone separator (4)    Air blower (5)