A reduced ring groove rivet at least includes a pin having a head and a body connected to the head; a plurality of sets of ring grooves are equidistantly arranged on the body, and each of the sets of ring grooves includes a first ring groove and a second ring groove adjacent to the first ring groove, wherein the first ring groove has a first groove bottom and a first groove peak adjacent to the first groove bottom, and the second ring groove has a second groove bottom and a second groove peak adjacent to the second groove bottom; a diameter of the second groove bottom is smaller than a diameter of the first groove bottom, or a diameter of the second groove peak is smaller than that of the first groove peak, so that any of the plurality of sets of ring grooves can be breaking part during operation.