The utility model provides a frock for installation of large -scale snap ring, includes: relative two the same frames that set up, install spacing groove, fixed pin in every frame both sides, wherein, the frame facet is the trapezium structure, and the front of frame is " concave " style of calligraphy structure, and the base of frame is the bathtub construction. The utility model discloses the structure is succinct, and the preparation is convenient, not only can take one's place large -scale snap ring accuracy very fast, has reduced the installation degree of difficulty to large -scale snap ring, difficult, the inefficiency scheduling problem of operation when having solved constructor and carrying out being connected between large -scale snap ring and the lug, simultaneously, the engineering time has been practiced thrift in the artifical use that has significantly reduced.