Hydraulic jig

The utility model provides a hydraulic jig which comprises a frame body, a jig fixed die and a jig movable die, the jig fixed die and the jig movable die are connected with the frame body, and the end face of the end, matched with the jig movable die, of the jig fixed die is provided with clamping faces which protrude, sink and protrude in the direction from the middle to the two sides. The corresponding end face of the jig movable die is provided with a clamping face with the middle sunken and the two sides protruding step by step in a stepped mode, a solenoid coil workpiece to be machined is fixed through clamping cooperation of the clamping faces of the jig fixed die and the jig movable die, and the jig movable die is connected with a hydraulic cylinder assembly and used for outputting linear displacement to push the jig movable die to be close to or away from the jig movable die. Compared with the prior art, clamping firmness is guaranteed, the situation that the structure of a finished product does not m