Grabbing device for grabbing plates at tail end of robot and using method of grabbing device

The invention discloses a grabbing device for grabbing plates at the tail end of a robot and a using method of the grabbing device, wherein the device structurally comprises a main body frame, air cylinders, protective claws and suction cups; the grabbing device is connected with the tail end of the robot through a power linkage assembly, and the power linkage assembly is in cross-linking with a visual system, a position detection system and a pneumatic control system; the two protective claws are hinged to the two sides of the main body frame correspondingly, and opening and closing of the protective claws are controlled by linkage of the two air cylinders; the suction cups are connected to a front side panel of the main body frame; the robot system controls the air cylinders to act through a power connection assembly and a pneumatic system, the air cylinders drive the protective claws to grab a plate, the pneumatic system vacuumizes the suction cups, and the plate is sucked and fixed on the suction cups, so