The utility model is applicable to the technical field of valves, and provides a marine valve convenient for locking a hand wheel, the top of a valve main body is fixedly connected with a shell, the top of the valve main body is rotatably connected with a rotating shaft, the rotating shaft is slidably connected with a connecting cylinder, the top end of the connecting cylinder is fixedly connected with the hand wheel, and the bottom of the connecting cylinder is fixedly connected with a clamping plate; a locking block is arranged on the inner side of the shell, one side of the locking block is fixedly connected with a pull rod, and a reset spring is arranged on the surface of the pull rod. The locking block is arranged to fix the clamping plate fixed to the bottom of the connecting cylinder, so that the hand wheel is locked, the hand wheel is prevented from moving due to the influence of external force, and unnecessary potential safety hazards are avoided; in addition, by designing a pressing rod and a rotating rod, a user can drive the rotating rod to move only by rotating the pressing rod, then the locking block is driven to move, locking of the clamping plate is relieved, the principle is simple, and operation is convenient and fast.