Long crankshaft fixing device for deep hole machining

The utility model discloses a long crankshaft fixing device for deep hole machining. The long crankshaft fixing device comprises a base, a V-shaped frame, a screw rod and a pressing plate. A through hole and a plurality of screw holes are formed in the base; a center shaft at the bottom of the V-shaped frame is in threaded connection with an adjusting nut, the center shaft of the V-shaped frame is inserted into a through hole of the base, the adjusting nut makes contact with the upper surface of the base, and the V-shaped frame is used for supporting a long crankshaft. The multiple screw holes in the base are in threaded connection with screws respectively, the tops of the multiple screws are connected with a pressing plate through nuts, and the pressing plate is used for pressing the long crankshaft. The crankshaft deep hole machining fixture can effectively fix one end, where a deep hole is machined, of a crankshaft, the end is prevented from shaking, and crankshaft deep hole machining precision is guarante