The invention discloses a connecting structure for mortise-tenon connecting components and a rolled-groove leaf-spring corner protector. The connecting structure comprises the three mortise-tenon connecting components and the rolled-groove leaf-spring corner protector, wherein the three mortise-tenon connecting components adopt long-axis structures; a first long tenon and a second long tenon, which are mutually symmetric in position, are formed on two opposite sides of the flat surface of an end part of each mortise-tenon connecting component respectively; a gap is reserved in the outer side of each second long tenon; two mutually symmetric short tenons are also formed on the two opposite sides of the flat surface of the end part of each mortise-tenon connecting component respectively; the first/second long tenon and the short tenon on the same side are arranged in a symmetry axis direction; meanwhile the intervals between the first long tenons and the second long tenons and the intervals between the short tenons together form mortises which are matched with the first long tenons; the three mortise-tenon connecting components are mutually perpendicularly connected through matching of the first long tenons and the mortises to form a three-axis three-way connecting structure; meanwhile, the gap of each mortise-tenon connecting component is flushed with the top surfaces of the first and second long tenons of another mortise-tenon connecting component, so that three clamping grooves are formed; and three clamping blocks matched with the clamping grooves are formed on the inner side of the rolled-groove leaf-spring corner protector.