PCB automatic clamping device

The utility model belongs to the technical field of PCB (printed circuit board) processing, and provides an automatic PCB clamping device which comprises two feeding guide rails arranged in parallel, a conveying mechanism and a clamping mechanism are arranged on the feeding guide rails, the clamping mechanism is communicated with the conveying mechanism, a support is arranged on the two feeding guide rails, a stop block is connected onto the support through a sliding assembly, and the stop block is connected with the feeding guide rails. The conveying mechanism comprises a first sensor, a second sensor, a first conveying assembly and a second conveying assembly, the first conveying assembly and the second conveying assembly communicate with each other, the clamping mechanism communicates with the tail end, away from the first conveying assembly, of the second conveying assembly, and the first sensor is located at the head end of the second conveying assembly. The second sensor is installed on the check block,