Hydraulic underwater mechanical pipe clamp

The utility model relates to a hydraulic type underwater mechanical pipe clamp which is provided with a pipe clamp body, an opening and closing device, a fastening device and a sealing device. The pipe clamp body is of a cylindrical structure and is composed of two semi-cylindrical half bodies, and a bolt sleeve, a top plate, a radial bolt and a hydraulic opening and closing device are arranged outside each half body. Axial and annular sealing strips are arranged on the inner wall; the two ends of the pipe clamp body in the axial direction are respectively provided with a semi-circular-ring-shaped abutting flange, and the two abutting flanges are provided with axial fixing bolts, nuts and dustproof rings. A locking bolt is further arranged on the jacking flange, and a base is arranged at the bottom of the pipe clamp body. The pipe clamp body is further provided with a lifting device and a sacrificial anode. The underwater pipeline repairing device is used for repairing engineering of underwater pipelines, has