The utility model discloses a frame bridge crane host computer is short rail load -bearing platform temporarily belongs to the indisputable road bridge roof beam structure field of establishing, including one end and putting up the supporting beam that props up that the bridge crane side is certain angle connector, the top hinges the lift arm of connecting propping up the supporting beam other end, and the level is laid on a bridge crane work platform and is stretched out a support rail of bridge crane work platform side, the short rail car of walking on support rail, support rail one end fixed connection other end on a bridge crane work platform is connected in the lift arm bottom perpendicularly, the utility model discloses can enough shorten flip -chip time, the quickening speed of setting a roof beam in place of the short section of track, can reduce an energy consumption of bridge crane advance and retreat machine again, improve economic benefits.