The invention discloses a device for controlling blowing of a dust collector. The device comprises a shell, an upper box, a lower box and filter bags, a differential pressure gauge is fixed onto a box outside a dust collector shell, the position of a sensor with 5-10mm distance away from the differential pressure gauge is fixed, the sensor is electrically connected with an electromagnetic valve, a high-pressure end of the differential pressure gauge is connected with a middle box in the dust collector through a hose, a low-pressure end of the differential pressure gauge is connected with the upper box in the dust collector through a hose, the electromagnetic valve is mounted in the upper box and electrically connected with a pulse valve, the pulse valve is connected with an air pocket mounted in the box, one end of the air pocket is connected with an air compressor through an air pipe, the pulse valve is connected with a blowing pipe in a threaded manner, sprayers are mounted on the blowing pipe at intervals, and the filter bags are correspondingly mounted below the sprayers. The device is simple in structure and good in blowing effect, and consumption of compressed air and capital investment can be reduced.