Combined positioning and clamping mechanism and method for implementing workpiece clamping

The invention discloses a combined positioning and clamping mechanism and a method for implementing workpiece clamping through the same. The size difference of supporting plates and the rotating torque of workpieces can be eliminated, the full and accurate workpiece positioning is ensured, and meanwhile the rigidity of frames is ensured and the force deformation of positioning pins is avoided. According to the technical scheme, the combined positioning and clamping mechanism is used for implementing positioning and clamping on a workpiece and comprises a base, a supporting assembly, a second positioning assembly and a stopping block assembly; the base is provided with a frame; the workpiece is arranged in the frame; the supporting assembly is arranged at the top of the frame and provided with a first positioning assembly; the first positioning assembly is matched with a poisoning hole formed in the top surface of the workpiece; the second positioning assembly is arranged on one side of a first lateral side of the workpiece; the second positioning assembly is matched with a poisoning hole located in the first lateral side of the workpiece; the stopping block assembly is arranged on one side of a second lateral side of the workpiece; the first lateral side of the workpiece and the second lateral side of the workpiece are opposite to each other.