Robot gripper capable of eliminating accumulated errors of migration program

The invention provides a robot gripper capable of eliminating accumulated errors of a migration program. The robot gripper comprises a flange, a fixing plate, a cushion cylinder, a photosensitive support, vacuum chucks, two or more connection rods and a mounting plate, wherein the flange is fixed to the top of the fixing plate and connected with a wrist part of a robot. The cushion cylinder is mounted on the side part of the fixing plate. Movable rods of the cushion cylinder are connected with the mounting plate with the vacuum chucks. When the cushion cylinder pushes downwards to press a workpiece, the contact surface of the workpiece compresses guide rods of the vacuum chucks; when the contact surface of the workpiece presses ejection rods, back pressure is generated, gas in the cylinder is compressed, and the accumulated errors are eliminated. The cushion cylinder is provided with the vertically downward movable rod, and the photosensitive support is mounted on the lower portion of the mounting plate. A sensor used for detecting materials is mounted on the photosensitive support. The connection rods are distributed on the edge of the lower portion of the mounting plate, and the corresponding vacuum chuck is arranged at the end, opposite to the mounting plate, of each connection rod. The vacuum chucks are used for sucking and grabbing materials.