Diamond cutter for high-precision deep hole machining

The utility model is applicable to the technical field of diamonds, and provides a diamond cutter for high-precision deep hole machining, which comprises a cutter handle, a cutter bar is transversely arranged at the front end of the cutter handle, a cutter head is arranged at the front end of the cutter bar, and fixing seats are transversely arranged at the top and the bottom of the cutter handle. Fixing plates are detachably arranged at the top and the bottom of the fixing seat, clamping grooves matched with the fixing plates are formed in the front side face of the fixing seat, the top of the fixing seat is in threaded connection with a threaded rod, and the bottom end of the threaded rod rotatably extends into the clamping grooves; a clamping opening matched with the threaded rod is formed in the top, located in the clamping groove, of the fixing plate, the cutter is protected, protection of the cutter is improved, the service life of the cutter is prolonged, and the problem that the machining precision is