The invention discloses a fastener for a scaffold wall-connecting rod and a use method thereof. The fastener comprises a semicircular tubular long buckle cover and two semicircular tubular short buckle covers located on the long buckle cover in parallel, wherein the short and long buckle covers are buckled with each other to form a cylinder space for hooping a wall-connecting rod; a lateral wall connecting sheet extends from one end of the long buckle cover on one side of the outer wall of the long buckle cover along the direction vertical to the axis; a top wall connecting sheet extends from the other end of the long buckle cover along the axial direction; bolt holes are formed in the lateral wall connecting sheet and the top wall connecting sheet. According to the fastener provided by the invention, the scaffold wall-connecting rod and the main structure can be stably connected with each other; the use safety of the scaffold can be ensured; the two mounting modes of lateral wall and top wall can be selected according to the architectural characteristics of the structures; the fastener provided by the invention almost has no influence on the later secondary structure and decoration construction, is free from repairing processes, including reserved hole treatment, is capable of effectively shortening the construction period, can eliminate the water leakage hidden danger, can be turned over and reused and is strong in practicability.