Vibrating screen for grading and selecting silicon powder

The utility model provides a silicon powder grading and selecting vibrating screen which comprises a screening box and a feeding port, sliding grooves are formed in the two sides of the inner wall of the screening box, and sliding blocks are connected into the sliding grooves in a sliding mode. A first motor is started to drive a disc to rotate, a cylindrical protruding block on the disc is driven to rotate, meanwhile, a strip-shaped block is linked to move left and right on a rotating shaft, and then the strip-shaped block is linked with a first screening net to slide left and right in a sliding groove through a sliding block; the effect that the first screening net is in linkage with the second screening net through the linkage rod to synchronously shake left and right is achieved, meanwhile, the first screening net and the second screening net are used in cooperation, the effect of conducting multi-stage screening on silicon powder is achieved, and the screening fineness and screening efficiency of the sil