The utility model discloses a light steel temporary bridge erected by utilizing a bailey truss. The device comprises a bailey truss, expansion bolts, foundation stones, limiting rods and steel plates,the bailey truss serves as a bridge body. the lower end is located on the foundation stone; the two are connected and fixed through an expansion bolt and a limiting rod; steel plates are laid at theupper ends of the bailey trusses to form bridge decks; the foundation stone is a finished prefabricated concrete member, enough strength and flatness are ensured, pouring on a construction site is notneeded, the expansion bolts are driven into the foundation stone according to set transverse and longitudinal intervals, fixation is firm and free of looseness, the expansion bolts and the limiting rods are welded and fixed, and bolt looseness caused by bridge body vibration can be effectively prevented. The temporary light steel bridge is simple in structure, the bailey trusses and the foundation stones are easy to obtain on a construction site, the force bearing components can be recycled for multiple times, the erection construction process of the temporary light steel bridge is accelerated, and the bridge construction time and economic cost are saved.