The mobile crossing scaffold is a device that utilizes the principle of umbrella extension, deploying an umbrella-shaped frame structure through a power system. The rope and the umbrella-shaped frame form a crossing scaffold net platform, which works in conjunction with a car crane to set up power grids. By adjusting the cranes boom and the posture of the crossing scaffold, the net platform is positioned above the cable to be protected. It mainly consists of a boom connection seat, pitch mechanism, rotation mechanism, deployment and retraction mechanism, umbrella truss net platform, and remote control system. The main arm ear holes of the crane are adjustable, ensuring reliable connections for cranes ranging from 50 to 80 tons; it allows real-time monitoring of the crossing scaffolds aerial posture; it uses a DC independent power supply, the control system simple to  operating.