Current guiding plate bolt tightener

The invention relates to the improvement of a current guiding plate bolt mounting and dismounting tool, in particular to a current guiding plate bolt tightener. The bolt tightener comprises an upper clamping piece and a lower clamping piece. The upper clamping piece and the lower clamping piece are oppositely arranged; the upper clamping piece is installed in a driving box in a rotary manner; the driving box is fixedly connected with one side of a power box; a main shaft in transmitting connection with a driving motor is installed in the power box through a bearing; the upper clamping piece is in fixed connection with a driven gear; the driven gear is in driving connection with a driving gear located at the upper end of the main shaft; the lower end of the main shaft is sleeved with a thread bushing; a vertically arranged sliding groove is formed in the lower end of the power box; a support arm is installed in the sliding groove in a sliding manner; the lower clamping piece is arranged at the outer end of the