The pneumatic system of the automatic sorting eggs platform was studied mainly, including the design and installation of the automatic sorting eggs platform, the design of pneumatic loop. And air compressor, pressure reducing valve, two position five way electromagnetic valve and other components which were used in the pneumatic circuit were selected. The pneumatic drive circuit was connected successfully. The pneumatic vacuum control system which could draw the defective eggs was studied. The feasibility of the pneumatic system was analyzed. The results show that the designed pneumatic drive circuit is right,and it can successfully suck up and sorting out the defective eggs.