Mobile platform for lower operation of shield tunnel

The utility model discloses a mobile platform for shield tunnel lower part operation, which comprises a platform unit composed of a support structure, a walking assembly and an operation platform, the support comprises an arc-shaped component, an inclined rod and a vertical rod, the operation platform is fixed on the top of the arc-shaped component, the top end of the vertical rod is fixed below the operation platform, and the inclined rod is fixed on the inclined rod. One end of the inclined rod is fixed below the working platform, the other end of the inclined rod is fixed in the middle of the arc-shaped component, and walking assemblies are arranged on the outer side of the bottom of the arc-shaped component and the outer side of the middle of the arc-shaped component. The mobile platform can be assembled on site in the tunnel, can be continuously used after being assembled once, and does not need to be repeatedly disassembled and assembled; tunnel lining segments do not need to be damaged, and installatio