Bailey truss for building construction

The utility model discloses a bailey truss for building construction, which comprises a frame assembly, and the frame assembly comprises two frame bodies, a supporting plate, a fixing plate, a through groove and an inserting plate. The assembling mechanism comprises a positioning plate, a through hole, a pin shaft, a baffle, a threaded column, a spring and a positioning hole; and one side of each of the two frame bodies is fixedly connected with an insertion plate. The baffle is driven by the positioning plate to move by rotating the threaded column, the moving baffle drives the pin shaft to move, the moving pin shaft slides in the through hole, so that one side of the positioning plate is opened, and then the other frame body is moved to drive the insertion plate to be inserted into the positioning plate. And then the threaded columns are reversely rotated, the baffles are used for driving the pin shafts to sequentially penetrate through the positioning holes and the through holes, and therefore the two fram