The invention discloses a storage battery groove for preventing deformation of short-edge side walls. Positioning grooves are formed in inner side walls at the periphery of two sides of ridges at which the short-edge side walls intersect long-edge side walls. Each positioning groove comprises two parts, namely a first groove formed in the corresponding short-edge side wall, and a second groove formed in the corresponding long-edge side wall; an anti-deformation elastic piece made of an acid resistance plastic material is arranged inside each positioning groove; each anti-deformation elastic piece comprises a support piece, an elastic piece and an adhesive-sealed butting piece; each support piece is in positioned connection inside the corresponding second groove and is leveled with the inner side wall of the corresponding long-edge side wall; each adhesive-sealed butting piece is in positioned connection inside the corresponding first groove and is leveled with the inner side wall of the corresponding short-edge side wall; the upper edges of the support pieces and the upper edges of the adhesive-sealed butting pieces are leveled with the upper edges of a groove box; each elastic piece can rotate to inside of the corresponding first groove by taking the cross line as an axis and is not protruded out of the inner side wall of the corresponding short-edge side wall. By adopting the structure, a phenomenon that the short-edge side walls swell and deform is avoided, the processing technology is simple, and the manufacturing cost is reduced.