The invention discloses a garbage internal heating type pyrolysis device. The garbage internal heating type pyrolysis device comprises an outer sleeve, a furnace body, a spiral internal heating pipe,a pyrolyzer heat preservation device, an end cover, a motor, a feeding / discharging opening, an impurity outlet device and the like; the outer sleeve of the pyrolysis device is a device for through-flow heating of hot fluid, and heat carried by hot fluid is used for heating materials through furnace body heat transfer; a central shell formed by the outer sleeve is an inner furnace body of the pyrolysis device and is a space for decomposing materials by absorbing heat; the spiral internal heating pipe is used for pushing to-be-pyrolyzed materials entering from the feeding opening to be pyrolyzed by the furnace body and discharged through the discharging opening through rotation a material inlet and a pyrolysis gas outlet are formed in the upper part of a pyrolysis chamber, a pyrolysis residue outlet and a heating medium gas inlet are formed in the lower end of the pyrolysis chamber, and a double-shaft screw is adopted to achieve stirring and propelling effect in the pyrolyzer, and can mutually clean garbage wound on shafts. The garbage internal heating type pyrolysis device has the advantages of being high in reliability, short in pyrolysis time, high in efficiency, good in effect,obvious in decrement, low in pollution, compact in structure, convenient to use and the like, and has wide market prospects in future garbage rear-end treatment.