The invention provides a garbage incinerator, and belongs to the technical field of furnaces. The garbage incinerator comprises an incinerator body, a draught fan and an air inlet blocking pipe, and is provided with a feeding opening. The incinerator body comprises an inner cylinder and an outer cylinder, the inner cylinder is arranged in the outer cylinder, and ventilation space is located between the outer cylinder and the inner cylinder. The air inlet blocking pipe comprises a header pipe and three branch pipes, one ends of the three branch pipes are communicated with the ventilation space, and the other ends of the three branch pipes are communicated with the header pipe. According to the garbage incinerator, garbage is divided by the air inlet blocking pipe, and it is avoided that the portion, close to the material opening end, inside the incinerator body is blocked by garbage; meanwhile, fresh charging can be supplemented through the air inlet blocking pipe, the temperature of the center of flames can be increased, and garbage burning efficiency can be improved.