Locking device for elbow machining

The utility model relates to the technical field of bend machining, and discloses a locking device and a clamping structure for bend machining, the clamping structure comprises a hydraulic assembly, a first connecting block, a second connecting block, a first connecting rod, a first rotating shaft, a second connecting rod, a second rotating shaft and a connecting seat, the output end of the hydraulic assembly is fixedly connected with the first connecting block, and the output end of the hydraulic assembly is fixedly connected with the second connecting block; the outer wall of the first connecting block is fixedly connected with second connecting blocks which are in bilateral symmetry, the outer walls of the second connecting blocks are rotatably connected with first connecting rods, the interiors of the first connecting rods are rotatably connected with first rotating shafts, and the outer walls of the first rotating shafts are rotatably connected with second connecting rods. According to the elbow clamping