NOVELTY - Inhibition of dioxin formation in domestic garbage and preparation of fuel comprises pre-treating waste, crushing, dehydrating and/or drying, feeding into closed vertical heat treatment device; feeding high temperature flue gas as heat source, controlling temperature, discharging materials after 0.2-4 hours, carrying out thermal cracking reaction to generate gaseous products and residue, collecting gaseous product for use as pyrolysis gas; discharging residue from vertical heat treatment device, transferring to incinerator and burning to form cinders; and discharging cinders.    USE - Method for inhibiting dioxin formation in domestic garbage and preparing fuel (claimed).    DETAILED DESCRIPTION - Inhibition of dioxin formation in domestic garbage and preparation of fuel comprises pre-treating waste, crushing to not greater than 30 cm, dehydrating and/or drying to less than or equal to 50 wt.% water content, feeding into upper part of closed vertical heat treatment device; feeding high temperature flue gas as heat source from lower, middle and/or upper side wall of vertical heat treatment device, where high temperature gas flows upwards and downwards, controlling temperature at 250-450 degrees C or at 150-800 degrees C, discharging materials after 0.2-4 hours of heating, carrying out thermal cracking reaction to generate gaseous products and residue, collecting gaseous product for use as pyrolysis gas; discharging residue from vertical heat treatment device, transferring to incinerator and burning to form cinders; and discharging cinders. An INDEPENDENT CLAIM is included for inhibition of dioxin formation in domestic garbage and preparation of fuel device comprising feeding conveyor (3), hydraulic reciprocating feeder, flange (5), vertical heat treatment apparatus (1), shell (2) and ash discharging machine (19).    DESCRIPTION OF DRAWING(S) - The drawing shows a process flow diagram of inhibition of dioxin formation in domestic garbage and preparation of fuel device.    Heat treatment apparatus (1)    Shell (2)    Feeding conveyor (3)    Flange (5)    Ash discharging machine (19)