The utility model relates to a railway construction field discloses a temporary construction beam for stopping change railway rails under arc manipulation spare, and temporary construction beam is used for setting up in treating more rail -changing way department, include: way base beam support, longeron, crossbeam and track support group spare, under the installing condition, way base beam support sets up in treating below the road bed that more rail -changing said that the longeron has been arranged respectively to the railway rails both sides, and each longeron puts up between the base beam support of adjacent way along railway track direction, and the longeron sets up the many crossbeams that are parallel to each other within a definite time, and detachably is fixed between crossbeam and the longeron, set up track support group spare between crossbeam and rail to on being fixed in the crossbeam with the rail. More rail -changing way department passes through temporary construction beam supporting rail treating to satisfy normal operating under the train load condition. After supporting the rail, in the hollow window time, demolish original track facility to lay ballastless track's track facility, and just roof beam of final demolition construction, and then realize that incessantly arc manipulation spare railway rails is down changed, safe, stably, high -efficient.