The invention discloses a garbage incineration device. The garbage incineration device comprises an extrusion cavity, an incinerator and a bent pipe. The bent pipe is connected with the extrusion cavity and the incinerator. The extrusion cavity comprises a feeding opening, a first motor, a first rotary shaft, a spiral push plate, a heating rod, a backflow groove, a backflow box and an extrusion block. The tail end of the extrusion cavity inclines upwards by 30 degrees. The feeding opening is formed in the front side of the upper end of the extrusion cavity. The first motor is arranged at the left end of the outer side of the extrusion cavity. The first rotary shaft is arranged in the extrusion cavity and penetrates the extrusion cavity to be connected with the first motor. The spiral pushplate is arranged on the first rotary shaft. The heating rod is arranged in the first rotary shaft. The extrusion block is arranged at the top of the rear end of the extrusion cavity. The transverse backflow groove is formed in the bottom end wall of the extrusion cavity. The backflow box is arranged at the lower end of the extrusion cavity and connected with the backflow groove. The garbage incineration device is simple in structure, reasonable in design and high in extrusion efficiency, and combustion is convenient.