Wire and cable tension adjusting device

The utility model discloses a wire and cable tension adjusting device, and relates to the technical field of cable construction. The device comprises a bottom plate, U-shaped supports are arranged at the two ends of the upper surface of the bottom plate, sliding grooves are formed in the two opposite ends of each support in a penetrating mode, and two symmetrically-distributed sliding blocks are arranged in each sliding groove in a sliding mode; the rotating wheels are matched with the first belt and the second belt to drive the four rotating rods to drive the double-thread screw to rotate at the same time, the sliding blocks inserted into the two ends of the double-thread screw in a threaded mode move in the opposite directions to limit electric wires and cables placed in the limiting grooves, and at the moment, the air cylinder pushes the fixing frame to move downwards; the limiting rollers arranged below the fixing frame make contact with the wire and cable between the two supports, tension in the wire and