The utility model discloses a portable automatic wire clamp of a short circuit grounding wire. The portable automatic wire clamp of the short circuit grounding wire can be operated conveniently and has a wide application range. The portable automatic wire clamp of the short circuit grounding wire includes an operation rod, a static support, a connection shaft, a transmission rack connected to the front end of the connection shaft, a pawl capable of engaging with tips on the outer surface of connection shaft, a pawl spring arranged between the static support and the pawl, and a moving wire clamp connected to the static support. A side of the front part of the static support is provided with a static wire clamp. An inner cavity of the static support is also provided with an over-bright gear connecting with the transmission rack in an engaging manner. The moving wire clamp includes a V-shaped part corresponding to a fixed wire clamp and an installation part installed on the static support flexibly. The outer end face of the installation part is provided with a rack engaged with the over-bridge gear. The front end of the operation rod connects with the connection shaft through a limit cam. A bead is arranged on the inner cavity face of the rear part of the static support, thereby preventing the limit cam from rotating continuously when a high face of the limit cam rotates to the position of the bead. A return spring is connected between the fixed wire clamp and the static wire clamp.