Steel wire balancer and special trolley provided with lifting arm support

The utility model relates to a steel wire balancer and a special trolley provided with a lifting arm support. The steel wire balancer is used for balancing the length difference of steel wires wound on mast pulley blocks positioned on a left side and a right side, and the steel wire balancer comprises a support frame and a balance wheel, wherein the bottom of the support frame is fixed; the central hole of the balance wheel is connected to the support frame through a shaft; the axial line direction of the balance wheel is perpendicular to the mast pulley blocks; the side wall of the balance wheel is provided with an inner groove; and one end of one steel wire is fixed on a winding drum with variable amplitude winding, and the other end of the wire rope is wound on the mast pulley block positioned on one of the left side and the right side, then wound in the inner groove positioned on the lower middle part of the balance wheel and then wound on the mast pulley block positioned on the other one of the left side and the right side to be fixed on the winding drum with variable amplitude winding. The steel wire balancer disclosed by the utility model has the advantages of small occupied space and limitless regulating quantity.