The invention discloses heat insulation type plastic pyrolysis equipment convenient to treat waste gas. The equipment comprises a furnace body and a gas suction pipe, the inner wall of the furnace body is provided with a heat preservation layer, a motor is mounted in the left inner wall of the furnace body, the gas suction pipe is mounted on the inner wall of the heat preservation layer, the innerside of the gas suction pipe is provided with a gas suction port, the right end of a waste gas pipe is fixedly connected with a purification chamber, a top plate is arranged on the outer upper wall of the purification chamber, the purification chamber is internally provided with a collection cavity, and a collection port is embedded in the outer wall of the collection cavity. A gas collection pipe is in embedded connection with the top plate, a seal cover is fixedly connected to the upper end of the gas collection pipe, and the middle end of the top plate is provided with a ventilation port.The heat insulation type plastic pyrolysis equipment has advantages that under the rotating action of a rotating shaft, waste plastic can be smashed through triangular blades to increase degradation speed and improve degradation efficiency; by arrangement of stirring scrapers on the outer wall of the rotating shaft, waste plastic accumulation is prevented, and uniform fusion of the waste plastic and catalysts is realized.