Plant seed disinfector

The invention discloses a plant seed disinfector, and belongs to the technical field of plant disinfection. The plant seed disinfector comprises an empty barrel, a suction nozzle, a piston, a piston shaft and a piston handle. The piston is connected with one end of the piston shaft, the piston handle is connected with the other end of the piston shaft, the piston is positioned in the empty barrel, the piston handle is positioned outside the empty barrel, a disinfection cavity is connected with the end, which is far away from the piston handle, of the empty barrel, the suction nozzle is arranged on the disinfection cavity in a communicated manner, the inner diameter of the suction nozzle is larger than the maximum diameter of seeds, and a valve for controlling the opening of the suction nozzle is arranged on the suction nozzle. The plant seed disinfector has the advantage that the problem of poor seed disinfection effects of reagents due to the fact that an existing empty barrel has small spaces and the reagen