Cable releasing device of marine seawater sampler

The invention belongs to the technical field of marine equipment, and particularly discloses a mooring rope releasing device of a marine seawater sampler. The mooring rope releasing device of the marine seawater sampler comprises a frame body, the frame body is rotationally connected with a rotating shaft, the rotating shaft is fixedly connected with a rotating cylinder, a mooring rope is wound on the rotating cylinder, the frame body is fixedly connected with a first fixing frame, the rotating shaft is fixedly connected with a first gear, the first gear is fixedly connected with a first rotating piece, and the first fixing frame is fixedly connected with a fixing piece. The first rotating piece is fixedly connected with a first plate, and the fixing piece is slidably connected with a second plate in a sealed mode. The cavity between the first rotating part and the fixed part is blocked through the second plate, so that the rotating cylinder is locked, the sampler starts to work in a sea area with the target