Anti-collision device for welding robot

The utility model belongs to the technical field of welding robots, and particularly discloses an anti-collision device for a welding robot, which comprises a welding gun pipe fixedly arranged on a manipulator and used for welding a workpiece; wherein a sleeve used for protecting the welding gun pipe is fixedly arranged outside the welding gun pipe, a containing cavity used for containing the welding gun pipe is formed in the sleeve, and four limiting plates used for colliding with external workpieces are circumferentially distributed outside the sleeve; according to the welding gun tube, a sleeve and a limiting plate surrounding the outer portion of the welding gun tube can make contact with an external workpiece firstly, the situation that when the welding gun tube collides with the external workpiece, the welding gun tube is damaged due to the fact that the welding gun tube directly collides with the external workpiece is avoided, and a robot controller can control a robot to stop working after receiving a