The system consists of two levels of purification, including two sets of purification tanks and two sets of water seals. Molecular sieves are used in the purification tanks, and water fire retardants are used in the water seals. The purified pyrolysis gas supplies heat to the pyrolysis furnace through the tail gas burner. The pyrolysis gas produced by the pyrolysis of domestic waste basically meets 80% of the energy consumption required for pyrolysis of domestic waste. It can greatly reduce the