Disclosed is a portable short circuit ground wire clamp, comprising a wire clamp body and an insulating block. The wire clamp body comprises a joint and a fixed head, wherein one end of the fixed head is provided with a cylindrical groove; the sidewall of the cylindrical groove is provided with a long groove and a helical groove, with the radial center line of the long groove being parallel to the axial center line of the cylindrical groove; the helical groove and the long groove intersect and communicate at the inter-junction point; one end of the joint is provided with an inserting rod matched to the cylinder; the sidewall of the inserting rod is provided with a fixture block, with the height of the fixture block being respectively matched to the depth of the long groove and the helical groove; the inserting rod can insert into the cylindrical groove; and the fixture block can slide along the long groove and screw in the helical groove, thereby forming the installing cooperation between the joint and the fixed head. The portable short circuit ground wire clamp employs a disengaging structure, facilitates dismounting, shortens the time for dismounting and arranging ground wire, ensures the smooth finishing of the switching operation, and reduces the power-failure duration. The joint and the fixed head are firmly installed and cooperated, with excellent contact, thereby avoiding the loosening or shedding of the ground wire resulting from human touch.