The invention belongs to the technical field of sofa accessories, particularly relates to a sofa supporting leg and solves the technical problems that the structural strength is low, the structure is complex and the like in the prior art. The sofa supporting leg comprises a cylindrical supporting part, a positioning stand is arranged at the bottom of the supporting part, a first installation plate which is connected with the supporting part in an integrated structure and arranged horizontally is arranged at the top end of the supporting part, an auxiliary supporting part which is connected with the supporting part by a detachable connection structure is arranged on the side surface of the supporting part, a second installation plate which is located in the same horizontal plane with the first installation plate and arranged horizontally is arranged at the top end of the auxiliary supporting part, an included angle is formed between the auxiliary supporting part and the supporting part and ranges between 20 degrees and 50 degrees, and an anti-slip structure is arranged at the bottom of the positioning stand. The sofa supporting leg has the advantages that the structure strength is high, the service life is long, the structure is simple, and the sofa supporting leg is easy to process and manufacture.