The utility model discloses a device for preventing and controlling a steel wire rope of a beam-pumping unit from being twisted, which is used in oil industry and arranged between a bracket and a rope suspender of the beam-pumping unit and can prevent and control the steel wire rope from being twisted. The device comprises connecting shafts and a telescopic component, wherein the telescopic component is arranged between the connecting shafts which are respectively arranged on the bracket and the rope suspender of the beam-pumping unit; and the telescopic component is telescopic along with the movement of the rope suspender, thus preventing the steel wire rope from being twisted again in a forcing way. The device is simple in manufacture, convenient in installation and low in cost and can provide benefits for long time after being installed at a time. The device effectively controls the problem of the twisting of the steel wire rope, facilitates the acquiring of indicating diagram material and facilitates production management. The device obviously reduces the labor intensity of workers, and leads the workers not to work at height for solving the problem of the twisting of the steel wire rope any more, thus improving the coefficient of safety production.