The invention discloses a safe electric power circuit erecting device. The safe electric power circuit erecting device comprises a lifting device and a knocking drive machine fixedly mounted at the bottom of the lifting device. A bottom groove is formed in the bottom face of the knocking drive machine. A knocking plate is connected in the bottom groove in a sliding fit manner. A first chamber extending upwards is arranged on the inner top wall of the bottom groove in a communicating manner. A second chamber is arranged at the position, on the upper side of the first chamber, in the knocking drive machine. A knocking drive device is arranged in the second chamber. A sliding block in fit connection with the knocking drive device is connected in the first chamber in a sliding fit manner. Pushrods extending up and down are connected to the left side and the right side of the sliding block in a sliding fit manner. The extending tail of the bottom of each push rod stretches into the bottomgroove and is fixedly connected with the top face of the knocking plate. A through cavity arranged in a left-and-right through manner is formed in the sliding block. The safe electric power circuit erecting device is simple in structure and convenient to operate, the safety of knocking work is improved, and meanwhile the knocking efficiency and the knocking effect are improved.