The invention discloses a lifting valve device for dust collector, which comprises a lifting mechanism, a valve lifting rod, a first valve plate and a second valve plate; the lifting mechanism is connected with the first valve plate through the valve lifting rod, the second valve plate and a lifting regulation structure are arranged at the outside of the first valve plate, the upper part of the second valve plate is connected with the lifting regulation structure to form a sealed space so as to hold the first valve plate in the sealed space. According to the invention, the lower end of the valve lifting rod is connected the first valve plate held in the sealed space formed by the second valve plate and the lifting regulation structure, the first valve plate is lift to make the pressure differences on the two sides of the valve plate be approximate so as to communicate the two sides of the second valve plate to eliminate the pressure difference between the upper and lower sides of the second valve plate so as to reduce the lifting force of the second valve plate; the device is simple, compact and reasonable, and the device has the advantages of improving the dedusting efficiency of the dust collector, saving energy and prolonging the service life of the filter bag.