Clamping mechanism and clamping device

The utility model provides a clamping mechanism which is used for clamping a jig, the jig comprises a body, a pressing piece, a clamping block and a stop block, the pressing piece is arranged on the body and connected with the clamping block, and the stop block is connected with the body. The clamping mechanism comprises a fixing base, a clamping piece, a first driving piece, a sensor, a pushing piece and a second driving piece, the first driving piece is connected with the fixing base and the clamping piece and used for driving the clamping piece to clamp the body, and the sensor is arranged on the clamping piece and used for sensing the body located on the clamping piece and a workpiece located between the clamping block and the stop block; and the second driving piece is connected with the pushing piece, is coupled with the sensor, and is used for driving the pushing piece to push the pressing piece to push the clamping block when the sensor senses the body positioned on the clamping piece, and driving the