Mechanical self-adaptive clamp

The invention discloses a mechanical self-adaptive clamp, and belongs to the technical field of clamps. The fixture comprises a fixture base and an original point positioning assembly arranged on the fixture base, the original point positioning assembly comprises an original point body, an original point pin and an original point pressing block, the original point pressing block presses or loosens a workpiece under the action of an original point pressing block driving mechanism, and the original point pressing block driving mechanism comprises an original point pressing rod, an original point rack, an original point gear and an original point pressing plate. The original point pressing block is arranged on the original point pressing plate in a position-adjustable mode, and the lower end of the original point pressing rod is connected with the original point base through an original point pressing rod spring. The positioning and supporting device is simple in structure, convenient to operate, capable of achi