The invention belongs to the technical field of buildings, and particularly relates to a corner fitting connecting light-body board house. A corner fitting which is constituted by an opened pad board,a locating pin and a column-end opened end board is adopted to splice a frame which is welded by a steel member as a light-body wall board of a steel framework into the board house, so that the light-body board house is formed. The opened pad board, the locating pin and the column-end opened end board can constitute three different forms of corner fittings to satisfy splicing of light-body wall boards in all directions; meanwhile, the specific size of three kinds of corner fittings is determined according to force-transferring features and loads of the corner fittings with three connecting forms, thus it is guaranteed that the light-body board house which is connected by corner fittings is reliable in force transferring, joints are safe, and welding-free quick construction of a construction site is achieved.