The present invention relates to a marine vessel winch equipped with hermetically sealed clutches including: a support plate on which a plurality of support frames is disposed; a rotary shaft rotatably coupled to the support frames; a rope drum having a first fixing clutch mounted on one side thereof; a chain drum having a second fixing clutch mounted on one side thereof; a first moving clutch and a second moving clutch coupled slidably movably to the rotary shaft and selectively engaged with the first fixing clutch and the second fixing clutch; and sealing members having one side surfaces coupled in circumferential directions to predetermined positions of the outer peripheral surfaces of the rope drum and the chain drum and having the lower portions of the other side surfaces brought into contact with the outer peripheral surfaces of the first moving clutch and the second moving clutch.