Heat insulation device of hazardous waste incinerator

The utility model relates to a hazardous waste incinerator heat insulation device which comprises an incinerator body, a heat preservation cylinder and a gas guide pipe, the heat preservation cylinder is arranged on the outer wall of the incinerator body in a sleeved mode, a heat preservation cavity is formed between the heat preservation cylinder and the incinerator body, the bottom of the heat preservation cylinder is provided with an exhaust port, and the exhaust port is communicated with the gas guide pipe. One end of the gas guide pipe communicates with the top of the incinerator body, and the other end of the gas guide pipe communicates with the bottom of the heat preservation cylinder, so that gas produced in the incinerator body is guided into the heat preservation cylinder along the gas guide pipe; the problems that an existing incinerator needs to be provided with a multi-layer heat insulation structure to reduce loss of internal heat energy, and the manufacturing cost of the incinerator is high due