Robot gripper

The utility model discloses a robot gripper which comprises a frame body, the top of the frame body is fixedly connected with a first air cylinder which is horizontal with the frame body, an output shaft of the first air cylinder is fixedly connected with a movable frame, and two first clamping devices are fixed to the position, located at the bottom of the frame body, of the movable frame. Two sets of second clamping devices are fixed to the bottom, away from the first clamping devices, of the frame body, and the two sets of first clamping devices and the two sets of second clamping devices are located at the same height and located at the four corners of the same rectangle. Compared with the prior art, the first clamping device and the second clamping device can be clamped on the edge of the spool, the first air cylinder can drive the moving frame to move horizontally, and therefore the distance between the first clamping device and the second clamping device is changed, and a robot can grab or put down the