The utility model discloses a pack three fulcrum balanced systems of roof beam body, including all carrying the girder system synchronous jack system that unifies, be fixed with below two all carry the roof beam and arrange in proper order, one of them jack that all carries under the roof beam is a set of, and the jack that the opposite side all carried under the roof beam divide into two sets ofly, in the hydraulic system of every group jack, jack oil circuit UNICOM forms the same independent hydraulic system of top power, and the independent hydraulic system of three groups is connected with master control system again, each group's jack makes a concerted effort a little to fix, and the equivalence is a concentrated force of the some department that makes a concerted effort, and the equivalence of three jack systems of group be three zhi dingdian, and three zhidingdian forms a plane top system of letter, organizes equivalent zhidingdian by three and constitutes three point support and cover including the scope must enclose roof beam weight pericardium the utility model discloses can solve a roof beam body top system in transit, real-time self-adaptation ground elevation changes, guarantees that the roof beam body is in the technical problem of a plane top state