The utility model relates to a be used for coaxial bore hole device of multiunit long distance. It includes: three -phase asynchronous motor, cycloidal pin wheel speed reducer, removal planker, fixed planker, T type lead screw, T type copper nut, axial thrust bearing, longitudinal movement adjusting nut, boring bar fixing base A, boring bar fixing base B, thrust bearing, pinion, gear wheel, radial bearing, boring bar, boring machine dead lever etc. Compress tightly this bore hole device dead lever on the knife rest of the arbitrary one side of double column planing machine, knife rest adjustable?horizontally and vertical migration, the accurate location of amesdial is leaned on to displacement, and the bore hole axiality is high, and the roundness tolerance homoenergetic in its axiality and hole reaches the designing requirement. Be applicable to the processing in the hole that various distances and concentricity expected much.