Multistage dust collecting device for ultrahigh-temperature vacuum sintering furnace

The invention provides a multistage dust collecting device for an ultrahigh-temperature vacuum sintering furnace. The multistage dust collecting device comprises a closed outer shell, a gas inlet pipe, a plurality of first circular table shaped pipes, a plurality of second circular table shaped pipes and a third circular table shaped pipe. According to the multistage dust collecting device, a multi-directional zigzag gas circulation channel is defined by the gas inlet pipe, a gas blocking plate, the first circular table shaped pipes, the second circular table shaped pipes and the third circular table shaped pipe, gas collides and is blocked for multiple times when flowing in the gas circulation channel, dust in the gas is separated from the gas in the plurality of times of blocking the collision process, finally the gas subjected to dust removal is discharged out of the closed outer shell, the separated dust is accumulated in the closed outer shell, and therefore the dust collection and purification of the ga