The utility model discloses a hollow pipe sealing system of a gearbox. The device comprises a supporting plate, Aluminum alloy pipe, wherein the pipe joints, the hollow pipes, the sealing plugs, the bearings, the end covers, the framework oil seals, the oil return through holes and the hollow pipe output ends are arranged, every two adjacent aluminum alloy pipes are connected through the corresponding pipe joint to form an aluminum alloy pipeline channel, and one end of each aluminum alloy pipeline channel is inserted into a round hole formed in the middle of the supporting plate; The combinedsealed aluminum alloy pipe is additionally arranged in the hollow pipe of the gear box and the middle hole of the main shaft, and the slip ring communication cable penetrates through the aluminum alloy pipe, so that the aluminum alloy pipe plays a role in isolating the slip ring cable, and oil is prevented from entering the slip ring cable and the slip ring cable.