Lathe for shield body of shield tunneling machine

The utility model discloses a lathe used for a shield body of a shield tunneling machine, which comprises a bottom plate, the top of the bottom plate is fixedly connected with a U-shaped seat, the U-shaped seat is rotatably connected with two driving rollers, the outer side of the U-shaped seat is provided with a driving mechanism, the top of the bottom plate is provided with an air pump, the output end of the air pump is fixedly connected with a three-way pipe, and the output end of the three-way pipe is fixedly connected with a rotating shaft. A piston pipe is fixedly connected to the top of the bottom plate, a piston rod is slidably connected to the piston pipe, and a supporting seat is fixedly connected to the top end of the piston rod. According to the shield body supporting device, shield bodies of different specifications and sizes can be supported, the applicability is wide, the shield bodies can rotate along the axes of the shield bodies in the supporting process, drilling operation can be rapidly co