Transmission limit device for soft cable traction video camera

A transmission limit device for a soft cable traction video camera comprises four support tower columns, pulley brackets, drivers, pulley sets, soft cables and a video camera. The four support tower columns are perpendicularly fixed on the ground to form a cuboid space for the video camera to move. One pulley bracket is fixed at the top end of each support tower column and used for fixing one pulley set. Each pulley set comprises a base, a pulley, a pulley shaft and a pulley support, wherein the pulley is arranged on the pulley shaft, two ends of the pulley shaft are fixed on two support lugs of the pulley support, and the pulley rotates around the pulley shaft, the base is provided with a frustum, a mounting shaft is arranged at the center of the frustum and provided with a threading hole, a ball is arranged between the frustum and the pulley support, and the pulley support rotates around the mounting shaft, and the two rotation directions are perpendicular to each other. The soft cables wind on the drivers and are jointly connected to the video camera through the pulley brackets and the pulley sets on the support tower columns. The drivers are fixedly connected to the bottom end of the support tower columns and connected with a computer to control winding and unwinding of the soft cables.