The invention discloses a double-rod and single-surface stair corner armor. The double-rod and single-surface stair corner armor comprises a stair base layer, a slurry layer plastered on the stair base layer and a corner armor body buried in the slurry layer. The corner armor body comprises main rods and auxiliary rods. The main rods are arranged on the external corners of the stair base layer and comprise the first main rods and the second main rods, the first main rods and the second main rods are fixedly connected, and a plurality of the auxiliary rods are fixedly connected to the joints of the first main rods and the second main rods at intervals and arranged on the transverse plane of the slurry layer. The double-rod and single-surface stair corner armor is simple and firm in structure and convenient to manufacture, the two main rods are arranged on each external corner so that each external corner of stairs can be effectively protected, raw materials are greatly saved, plastering is easy, and the work efficiency is improved.