The invention discloses a butt connecting component for light steel structured housing construction, comprising a convex end assembly, a concave end assembly, an upper pipe, a lower pipe and a cross beam. The upper beam is sleeved outside the upper end of the convex end assembly; steps are arranged in the middle of the convex end assembly; the lower end of the convex end assembly is inserted intothe upper end of the concave end assembly; the lower pipe is sleeved outside the lower end of the concave assembly; and a lug is arranged outside the upper end of the concave end assembly for fixing the cross beam. The butt connecting component has the advantages of 1. simple structure, connecting adaption among upright columns in different lengths; 2. safety and reliability; and 3. convenient and quick actual assembly and operation.