The tubing rotator originally used in the eccentric test process string in the oil field is rotated through the steel ball between the upper and lower joints, and can rotate 360° arbitrarily. However, with the improvement of the process, the tubing rotator is required to stop after turning N turns (usually 3 turns), and vice versa. This tubing rotator is applied to the screw pump oil extraction eccentric test process pipe string, installed on the upper part of the screw pump, and used in conjunction with the eccentric wellhead. When working, the upper joint faces up and the lower joint faces down to connect to the pipe string and follow the pipe. When the column is lowered into the well, the tubing can be rotated under pressure while the pump body is anchored, which can solve the problem of tubing loosening caused by the reaction torque when the screw pump stops during the production process, and can also solve the problem of tubing loosening during the test process. The contradiction between twisted test cables.