The utility model provides a grounding downlead manufacturing assisting tool, which comprises a base. One end of the base is horizontally provided with a jack; the other end the base is provided with a bending pressing die; the head part of the jack is provided with a flat top punching pressing die; the jack is also provided with a disc-type rocking arm capable of driving the top punching pressing die to extend out; the top punching pressing die is arranged in front of the top punching pressing die and comprises two long strip-shaped pressing plates axially and symmetrically arranged along the top punching pressing die; one ends, far away from the top punching pressing die, of the two pressing plates form an included angle, and the included angle is no less than 30 DEG; and a tool handle is also horizontally arranged outside one end, provided with the jack, of the base. According to the grounding downlead manufacturing assisting tool, a wider bendable angle range is provided while the manufacturing quality of the grounding downlead is ensured; the weight is light; the operation is simple; time and labor are saved; and damage on a galvanized layer on the surface of grounding round steel can be reduced maximally.