Supporting device for machining large-diameter shield body

The utility model discloses a supporting device for machining a large-diameter shield body, and relates to the field of shield body machining. The supporting device for machining the large-diameter shield body comprises at least two sets of first supporting pieces and at least two sets of second supporting pieces which are alternately arranged in the circumferential direction, and each set of first supporting pieces comprises two symmetrically-arranged first supporting frames; the first supporting frame comprises four first supporting rods and a plurality of first connecting rods, wherein the first supporting rods are vertically arranged, the tops of the first supporting rods are located at the four vertexes of the isosceles trapezoid, and the two ends of each first connecting rod are connected with the two adjacent first supporting rods respectively. The second supporting piece comprises two symmetrically-arranged second supporting frames, each second supporting frame comprises four second supporting rods an