New energy efficient grinding tool

The invention provides a new energy efficient grinding tool which comprises a workbench, lifting supporting columns are oppositely arranged at the top of the workbench, lifting plates are slidably connected to the inner sides of the lifting supporting columns, a movable supporting plate is connected to the middle of the symmetrical lifting plates, a first motor is arranged on the movable supporting plate, and a fixing disc is arranged at the bottom of the first motor. The metal hole polishing device comprises a workbench, a fixing disc is arranged in the workbench, rotating parts meshed with each other are arranged in the fixing disc, the bottoms of the rotating parts are detachably connected with rotating ropes, the bottoms of the rotating ropes are connected with polishing rods, sliding grooves are symmetrically formed in the top of the workbench, and the sliding grooves are connected with special-shaped clamping mechanisms in a matched mode. The technical problems that metal holes are ground one by one, th