Clamp telescoping mechanism

The utility model relates to a clamp telescoping mechanism which comprises a bottom plate, an air cylinder, a linear guide rail, a sliding plate, a sliding block, a first baffle, a first support, a second support and a positioning unit. The linear guide rail is fixedly connected to the rear side face of the bottom plate, the sliding block is fixedly connected to the front side face of the sliding plate and slidably connected with the linear guide rail, the air cylinder is connected between the sliding plate and the bottom plate and used for driving the sliding plate to linearly reciprocate along the linear guide rail, and the positioning unit is fixedly connected to the sliding plate. The first baffle is a strip-shaped plate with the length extending in the vertical direction and shields the rear portion of the linear guide rail, the upper end of the first baffle is connected with the upper portion of the bottom plate through a first support, the lower end of the first baffle is connected with the lower porti