The utility model discloses a city rail U type roof beam end -blocking template device, including a side mutually perpendicular welded diaphragm and a vertical plate, on the bottom surface of diaphragm the interval set firmly many with vertical plate face looks vertically supports the rib, the one end that supports the rib and the outside of diaphragm be along flushing, and the bearing diagonal rib that extends on its other end and the vertical plate links firmly mutually, the below of supporting the rib is provided with telescopic leg, telescopic leg's lower extreme is provided with the walking wheel. The utility model has the advantage of simple structure, need not to relapse the dismouting, operation and removal are simple and convenient. Size design end -blocking template device according to the precast beam need not the manual work and assembles the template again to at the below of end -blocking template device installation telescopic leg and walking wheel, through the height of the adjusting telescopic leg precast beam that aligns, need not to install repeatedly, reduce the input of manpower, material resources, greatly reduced operation and time of removing, improved work efficiency.