A single-groove blind fastener and a mounting method therefor. The single-groove blind fastener comprises a rivet and a collar. The rivet consists of a rivet head (1.1), a polished rod (1.2), a locking groove (1.3), a tail broached groove (1.4), a tail tooth (1.5) in sequence. The collar consists of a sleeve (2.1) and a cap head (2.2). The tail of the rivet is a single-groove short tail structure. The ratio of the length of the tail broached groove to the total length of the tail tooth is 0.1-1.5. An included angle A between the generatrix of the bottom of the tail broached groove (1.4) and the axis of the rivet is -30° to 0°. Two axial ends of the bottom of the tail broached groove (1.4) are fillet transition structures. The ratio of the length of a flat portion of the tail tooth to the total length of the tail tooth is 0.1-1. The tail of the tail tooth (1.5) is a fillet transition structure.