The invention provides a fast self locking type grounding wire clamp with the advantages that the pressing connection is firm and reliable, and the application is wide. The fast self locking type grounding wire clamp comprises a support plate, wherein a guide rod is designed at the right end of the support plate, an upper wire pressing plate is designed at the upper end of the guide rod, a lower wire pressing plate is designed above the support plate, a U-shaped opening is rightwards arranged on the lower wire pressing plate, the U-shaped opening is matched with the guide rod, a fixing cover is fixedly connected with the lower surface of the support plate, an upper transmission gear, a lower transmission gear and a support gear are fixedly connected in the fixing cover through shafts, an upper transmission rod is designed at the left side of the upper transmission gear and the lower transmission gear, the upper transmission rod is engaged with the upper transmission gear and the lower transmission gear, the upper end of the upper transmission rod is fixedly connected with the lower wire pressing plate, a lower transmission rod is engaged between the upper transmission gear and the support gear, one end of the lower transmission rod extends out of the fixing cover, a spring pin is fixedly connected inside the fixing cover, and the spring pin is clamped and connected with right teeth of the lower transmission rod.