Inner wall oiling device for steel pipe of pipe-sinking cast-in-place pile

The utility model discloses an oil coating device for the inner wall of a steel pipe of an immersed tube cast-in-place pile, which comprises an oil coating mechanism and a traction mechanism used for driving the oil coating mechanism to linearly move back and forth, the oil coating mechanism comprises a main shaft, two base discs and a plurality of arc-shaped thin oil storage tanks, the two base discs are connected to the main shaft, and the relative distance between the two base discs can be adjusted; the thin oil storage tanks surround the outer side of the main shaft in an annular array mode in the circumferential direction, the base disc is connected with the thin oil storage tanks through connecting rods, sponge layers are attached to the cambered surfaces of the outer sides of the thin oil storage tanks, oil seepage openings are formed in the cambered surfaces of the outer sides of the thin oil storage tanks, and the sponge layers are connected with the thin oil storage tanks. And oil in the thin oil st