The invention discloses an inner hole liquid scraping-off device. The inner hole liquid scraping-off device comprises a center shaft (1), a spiral body (2) is sleeved with the middle portion of the center shaft (1), bearings (3) are arranged at the two ends of the center shaft (1), and a buffer head (4) is arranged outside each bearing (3); the spiral body (2) comprises a shaft body (21) and a vane (22), the shaft body (21) is a taper shaft, the small end of the shaft body (21) is in transition fit with a pipe fitting (6), and the large end of the shaft body (21) is in interference fit with the pipe fitting (6); a connecting hole (5) is formed in one side, close to the large end of the spiral body (2), of the center shaft (1), and a spiral oil removing body rotates in the pipe fitting to form extrusion scraping-off on the inner wall of the pipe fitting; in addition, the spiral body is arranged in a taper shape, so that the multiple scraping effects is achieved; the connecting hole is formed, and a rotating shaft can be inserted into the connecting hole, so that mechanical oil removing is achieved; and a supporting rod can be additionally arranged, manual oil removing is achieved, and the inner hole liquid scraping device is suitable for different working conditions.