Disclosed is a scraper conveyer middle groove with a groove ledge in a steel plate installed and welded structure. The scraper conveyer middle groove with the groove ledge in the steel plate installed and welded structure is formed through installing and welding of a shoveling plate sharp part, strengthening ribs, a shoveling plate groove ledge, a guiding plate, a middle plate, a base plate, side plates, big bent plates, small bent plates, a connecting plate, rail bases, dumbbell pin connection bases, a lower guiding plate, an upper guiding plate, a front upper wing plate, a back upper wing plate, a back base plate, a checking plate groove ledge, a standing rib plate, a pulling lug, a bottom rib plate and the like. After two sections of middle grooves are in butt joint, the two sections of middle grooves are located through pin shafts, and the dumbbell pin connection bases of the two sections of middle grooves are connected through a dumbbell assembly. The shoveling plate groove ledge and the checking plate groove ledge are all manufactured from a steel plate and machined. A high-strength wear-resisting plate can be selected as the steel plate. Therefore, by means of the installed and welded structure, the problem that technical requirements for rolling the groove ledge are hard to meet is solved, and wear resistance of a middle groove ledge is improved.