Positioning and clamping device

The utility model provides a positioning and clamping device which comprises a supporting block, a pressing block, a fixed connecting plate, a shaft connecting plate, a rocker arm, a power connecting block, a power device, a clamping shaft and a telescopic rod. During use, the clamping shaft serves as a fixing shaft, the power device pushes out the telescopic rod, the pressing block and the rocker arm to move along a notch of the clamping shaft in the rocker arm, when the clamping shaft moves to the lower end of the notch, the clamping device is opened, and when the clamping shaft moves to the upper end of the notch, the pressing block makes contact with the supporting block, and a workpiece is in a clamped state. The clamping device is simple in structure, convenient to operate, safe, reliable and space-saving, the power connecting block is pushed by the linear air cylinder, so that the rocker arm and the pressing block move along the arc-shaped track along the clamping shaft, interference can be avoided whe