Dry type dust collecting device

The utility model discloses a dry type dust collecting device, comprising a dynamic force running system, a machine frame, a cross valve mounted on the machine frame, a dust absorption head connected with one end of the cross valve and a garbage can. And wherein, a vacuum chamber and an expansion chamber are arranged on the machine frame, and a dust filtration cloth bag and an electric fan are arranged in the vacuum chamber. The secondary end of the cross valve is directly connected with one opening of the dust filtration cloth bag in the vacuum chamber, the other opening is arranged in a feed opening of the vacuum chamber and the garbage can is arranged under the feed opening, and the electric fan makes the air in the vacuum chamber be drained into the expansion chamber. The device is widely suitable for removing the dust in the area with much dust and large area of the road, the square, the storehouse, the stage arrangement, etc. and has good effect on removing the dust, without causing the secondary dust emission; the water resource is saved because of disusing the water spray; the garbage is directly packed; the city sanitation level is improved.