Roller with water storage cavity

The invention discloses a roller with a water storage cavity. The roller comprises a roller and a winch, wherein the roller comprises a lubrication mechanism, a fixed pulley and a rotating pulley which is arranged on the fixed pulley in a sleeving manner; a water storage cavity is formed inside the fixed pulley; the water storage cavity is connected with a water conveying device; a first water outlet is formed in the upper end part of the fixed pulley; a plurality of second water outlets matched with the first water outlet are uniformly formed in the rotating pulley in the circumferential direction; when the second water outlets are rotated to the outer side of the first water outlet, the water storage cavity is communicated with the outside atmosphere. The roller takes the advantages of the characteristic that the rotating pulley rotates in the lifting process, when the rotating pulley rotates slowly, a relatively small amount of heat can be generated by friction of the rotating pulley and a steel wire rope,