Mechanical arm horizontal rotating joint capable of vertically passing through steel wire rope

A mechanical arm horizontal rotating joint capable of vertically passing through a steel wire rope comprises a base, a flange plate, a supporting disc, a differential transmission mechanism and a steel wire rope reversing wheel train. A bearing piece extending in the axial direction is arranged on the flange plate, and an open annular plate extending in the axial direction is arranged on the supporting disc. The steel wire rope reversing wheel train is arranged on the flange plate and the supporting disc and used for guiding a direction-changing steel wire rope set in the vertical direction to the horizontal direction, the flange plate is connected with the output end of the differential transmission mechanism, the supporting disc is connected with the input end of the differential transmission mechanism, and the differential transmission mechanism is movably installed on the base. A power steel wire rope group for driving the flange plate to rotate is reversely wound in a pair of driving grooves. The length