Centering and clamping tool

The utility model discloses a centering and clamping tool which comprises a sliding base, a sliding block, a clamping block, a clamping block, a clamping block, a clamping block and a clamping block. The sliding base is rotationally connected with a lead screw, and the lead screw is provided with two threaded sections opposite in screwing direction; a first sliding block, a second sliding block and a third sliding block are sequentially connected to the sliding base in a sliding mode, the first sliding block is provided with a first threaded hole in threaded connection with one threaded section, the top of the first sliding block is connected with a first clamping block, and the second sliding block is provided with a second threaded hole in threaded connection with the other threaded section. A linear driving device is installed on the second sliding block and provided with a driving rod, the top of the third sliding block is connected with a second clamping block, and the third sliding block is fixedly conn