Pyrolysis device

The invention provides a pyrolysis device. The pyrolysis device comprises a conveying system, a preheating box, a high temperature decomposition box, a cooling box and loading devices; the preheatingbox, the high temperature decomposition box and the cooling box communicate in sequence and are all arranged on the conveying system; the conveying system can convey the loading devices to enter the preheating box, the high temperature decomposition box and the cooling box in sequence; the loading devices are used for bearing pyrolyzed pieces; a heating piece is arranged in each of the preheatingbox, the high temperature decomposition box and the cooling box; an openable/closable airtight door is arranged at each of an inlet of the preheating box, the position between the preheating box and the high temperature decomposition box, and an outlet of the cooling box; and the airtight door is used for closing the preheating box, the high temperature decomposition box and the cooling box. Through the scheme, the overflo