Welding robot capable of automatically and circularly cleaning track and blocking and guiding foreign matters

The invention relates to the field of welding equipment, in particular to a welding robot capable of automatically and circularly cleaning a rail and blocking and guiding foreign matters, which comprises a support sliding device, the support sliding device is slidably sleeved on the top end of a support frame body, and a welding arm is fixedly mounted in the center of the outer side of the support sliding device. The auxiliary cleaning device is fixedly installed at the top end of the supporting sliding device, the transmission device and the cleaning and lubricating device are fixedly installed on the inner side of the supporting sliding device, and the cleaning and lubricating device is located above the transmission device. And the transmission device comprises teeth, a contact extrusion block, an output motor, a first gear, a conical collection cavity, a first conical gear and a sealing cover, and the first gear is fixedly mounted at the bottom end of the output motor. And through the arrangement of the transmission device, the cleaning and lubricating device and the auxiliary cleaning device, transmission parts in the welding robot can be lubricated, and the paint surface of the welding robot can be cleaned.