The utility model discloses a restraint loading device that is used for cylinder anchor model equipartition stress in surrounding rock to simulate, including restraint counterforce device, annular high -pressure loading gasbag, trachea, flexible contractible hoop cover, the flexible power of biography rubber. The high -pressure loading gasbag of annular is cyclic annular section of thick bamboo structure, and flexible contractible hoop cover is pasted in the high -pressure loading gasbag inner ring of annular surperficially, passes the power board by arc -shaped sleeve, arc pressure spring, arc -shaped connection rod, arc loading and constitutes, and for cylindric structure, flexible of biography of power rubber is pasted and is passed power inboard surface, direct and cylindrical anchoring body model contact in the arc loading. Under the high -pressure loading gasbag loading constraining effect of annular, flexible contractible hoop cover contracts in can realizing automatically, guarantees that shrink in -process model cross section is circular all the time. The utility model discloses applicable in indoor cylindrical anchoring body model drawing test, that model body radial surface equipartition stress in surrounding rock acts on effective simulation guarantees that cylindrical model cross section in the loading procedure is circular all the time.