A cleaning sweeper truck waste gas utilization device comprises a dust collector, a waste gas pipe, a side brush, a high pressure waste gas diverting valve and a waste gas exhaust pipe; the side brushcomprises a first side brush and a second side brush; the first side brush and the second side brush are correspondingly arranged on the two sides of a dust collection opening of the dust collector;a waste gas pipe is connected to a gas exhaust hole of the dust collector; the waste gas pipe is connected with the high pressure waste gas diverting valve; and the waste gas exhaust pipe is connectedto the high pressure waste gas diverting valve. According to the cleaning sweeper truck waste gas utilization device, the waste gas is repeatedly and efficiently utilized to increase the energy efficiency ratio, the water resource waste is reduced, the influence of carrying dust pressing water on vehicle transporting power efficiency is reduced, the amount of muddy water on a road is reduced, andmeanwhile, the dust collection rate is increased, and reentrainment of dust is reduced.