The invention relates to a repairing and fixing structure for cracks of roads and bridges. The structure comprises a bridge body, the bridge body is filled with a filler layer, a waterproof layer andan asphalt layer. An expansion groove is reserved in the upper end of the filler layer; the filler layer is provided with a threaded sleeve; the threaded sleeve is in threaded connection with a screwrod; one end of the screw rod is in threaded fit with a connecting rod; the connecting rod is in clearance fit with a limiting rod; the bridge body comprises cracks, grooves, through grooves, inserting grooves and limiting grooves. the cracks are arranged under the grooves, the grooves are communicated with the lower through grooves; the through grooves are communicated with the limiting grooves below through the inserting grooves; the filler layer, the waterproof layer and the asphalt layer are arranged; when the cracks are repaired, the two connecting rods of the connecting screw rod are connected through the threaded sleeve, the cracks are protected, further expansion of the cracks is reduced, and by arranging the expansion groove, due to the expansion groove of the bridge body and thethrough hole of the connecting rods, the possibility of stress fracture at the weak part, close to the cracks, of the bridge body is reduced.