The utility model discloses a cable load circulation system's water pipe end sealing device, include: water inlet flange and sealing flange, wherein, water inlet flange is hollow cylinder, outwards extends first ring junction and second ring junction respectively at the both ends of cylinder, and hollow cylinder's side is provided with the water inlet, the sealing flange is hollow round platform, and third ring junction and fourth ring junction are outwards extended respectively to bottom surface and last bottom surface under it, first ring junction is connected with extraneous water pipe end head, and the water pipe end is extended the water pipe and is passed in proper order that the second is round, the mediate fourth ring junction of third, match with third ring junction each other second ring junction to through bolt fixed connection, the inner ring part of fourth ring junction is provided with the double -deck sealing silica gel of central fretwork, makes the water pipe laminating pass sealing silica gel, extends to outside the fourth ring junction. Adopt the utility model discloses technical scheme can improve the water -resistant piezotropy and the heat preservation ability of water pipe end seal.