Clamp type chain stretcher

The utility model relates to the technical field of polyimide film processing, in particular to a clamp type chain stretcher which comprises clamping devices which are the same in structure and oppositely arranged at the two ends of a stretcher body, and each clamping device comprises a conveying piece and a clamping piece arranged on the conveying piece. The control piece is used for controlling the clamping and releasing of the clamping piece and comprises a first control piece arranged at the front end of the clamping piece and used for clamping the clamping piece and a second control piece arranged at the rear end of the clamping piece and used for releasing the clamping piece, and the clamping piece comprises a plurality of clamps which are evenly distributed and adjacently arranged; the first control part comprises an adjusting seat and a brake part, the brake part comprises a first disc which is arranged on the outer side of the conveying part and matched with the clamp, the structure does not damage a