The invention discloses a multipurpose hydraulic vise, which comprises a metal fixed clamp body, a movable clamp body assembly, a central plunger pump assembly, a pre-clamping screw and a clamping screw; the pre-clamping screw and the clamping screw pass through their own The rotation pushes the movable vise body assembly to move on the metal fixed vise body, and the workpiece is clamped by the central plunger pump assembly. The use method of the multi-purpose hydraulic vise described in the present invention, by rotating the pre-clamping screw rod, the movable clamp body moves forward; after the force becomes larger, the ratchet pin presses down the spring, the clamping screw rod continues to rotate, and pushes the center plunger pump column The plug generates high-pressure oil, thereby pushing the piston rods of the two clamps to move to realize the clamping of the workpiece; at the same time, the invention also has the advantages of reasonable design, simple and compact structure, long service life, wide application range, and low production, operation and maintenance costs. , easy to popularize and use.