Pneumatic powder sampler

The invention relates to pneumatic powder sampler. The pneumatic power sampler comprises a sampling part, a conveying part and a collection part, wherein the sampling part is used for collecting a sample from an air conveying trough; the conveying part is used for conveying the sample; the collection part is used for collecting the sample; the sampling part comprises a sampling tube, a cylinder arranged at a right end of the sampling tube, and a flange arranged on an outer wall of the sampling tube; a sampling segment of the sampling tube is provided with sampling holes; the conveying part comprises a hose of which a lower end is inserted into the collection part; a piston rod is arranged in the sampling tube, and provided with a first piston and a second piston; and the gas width betweenthe first piston and the second piston is greater than the pore diameters of the sampling holes. A right end of the piston rod is connected with a piston rod of the cylinder, so that the piston rod can move linearly in a reci