The utility model discloses a pure light steel keel ceiling. The pure light steel keel ceiling comprises a rebate modeling base layer, gypsum boards and gypsum lines (4), and key keels (2), wherein the rebate modeling base layer comprises L type side keels (1) and rider keels (3), the rider keels (3) form a framework support of the rebate modeling base layer, and an internal corner and/or an external corner of the rebate modeling base layer are/is connected by the L type side keels (1) with full lengths; the gypsum boards and gypsum lines (4) cover a surface layer of the rebate modeling base layer to form an integral ceiling; the rider keels (3) are connected with the key keels (2); the key keels (2) are fixed on a roof through screw rods (5); and the L type side keels (1) are fixed with the rider keels (3) through rivets. The pure light steel keel ceiling can meet fire protection requirements of top surfaces and reduce the problems of the top surfaces such as formaldehyde content caused by wood base layers, and can solve a series of common quality problems such as cracking, deformation, corrodibility and worm damage which are caused by the wood base layers.