The invention discloses an air filtering and blocking preventive high-temperature pyrolyzing treating system for domestic garbage. The system structurally comprises a device body, an air blower, an air filtering device, a secondary incineration chamber, a stirring box, a controller and an air outlet pipe. The system has the beneficial effects that the advantages that: a dust-wrapping component isprovided with the soft magnetic plate and the barbs which are mutually matched to effectively treat the dust-laden waste gas incinerated by high-temperature pyrolyzing, and dust particles are chargedions and are adsorbed and adhered to the surfaces of the barbs under the magnetic action of the soft magnetic plate, so that the dust particles in airflow are effectively prevented from being blown out of the furnace to cause a large amount of dust accumulation at 4 positions and increase the load and difficulty for downstream flue gas purification. A magnetism increasing mechanism is provided forincreasing magnetism for a magnetic conductive fan plate, thereby preventing the problems that the magnetic conductive fan plate losses magnetism under high temperature, the dust particles cannot beadsorbed, air flowing out of the device includes a large amount of dust and the air pollution is caused.