Welding machine ground wire clamp

The invention discloses a welding machine ground wire clamp. The welding machine ground wire clamp is characterized by comprising a C-type body, wherein a tail end of an upper end portion of the C-type body is fixedly connected with a thread sleeve, a lower portion is fixedly connected with a conduction block, a screw which penetrates through the thread sleeve and is in matching with the thread sleeve is further comprised, the tail end of the screw is connected with a conduction nut, and the C-type body is further provided with a ground wire hole corresponding to the position of the conduction block. The screw is driven through rotation of a cross handle to move up and down, when the copper conduction nut and the copper conduction block contact, tight combination is realized, during use, small heat amount is generated, dismounting is simple, operation is simple and convenient, excellent conduction performance and high safety are realized, ground wire clamp replacement frequency is greatly reduced, so cost is