Abstract: Considering the current situation of substation grounding resistance test in our company, aiming at the problems of low electrification of current line and voltage line wiring devices for test, inaccurate positioning and tool loss, an electric vehicle for substation grounding resistance test which can realize fast wiring is designed. Its body is same as ordinary electric vehicles, and a rack is added to load tools and instruments such as iron piles, hammers, wrenches and gloves. The rear seat of the vehicle is equipped with a take-up / pay-off machine, which can automatically and quickly route and take-up during driving. The on-board positioning calculation system is used to calculate the position relationship between the current pole, voltage pole and substation at the wiring end point, and the practical benefit is remarkable.