The invention relates to a roadbridge crane capable of efficiently fixing heavy construction materials. The roadbridge crane comprises a cross beam, wherein a fixed connecting block is fixedly connected to the outer wall of the lower end of the cross beam, an electric moving trolley is fixedly embedded into an inner cavity of the fixed connecting block, the electric moving trolley comprises a first three-phase asynchronous motor, an electric roller, a cable drum and a fixed connecting plate, the electric roller is electrically connected to the outer wall of the upper end of the first three-phase asynchronous motor, the cable drum is rotatably connected to the middle of the outer wall of the lower end of the first three-phase asynchronous motor, the fixed connecting plate is fixedly connected to the outer wall of the lower end of the first three-phase asynchronous motor, and a fixed support plate is fixedly connected to the middle of the outer wall of the lower end of the fixed connecting block. According to the roadbridge crane, the integral height of the roadbridge crane can be automatically adjusted, the materials can be conveniently and stably lifted, operating personnel can conveniently operate, and the working efficiency is improved.