Abstract: An automatic riveting apparatus includes a base (10), a feeding device (30), and a riveting device (50). The base has a U-shaped support frame (12). Two photoelectric relays (18) extend upwardly from the base. The feeding device includes two parallel sliding rails (32), a lower die plate (36) for supporting a workpiece (80), and a feed cylinder (34) driving the lower die plate to slide along the rails. The riveting device has an upper cylinder (52) and a riveting head (58). In operation, the feed cylinder is started up to drive the lower die plate together with the workpiece to a riveting position. The lower die plate touches a photoelectric point (48) to actuate the upper cylinder. A piston rod (60) of the upper cylinder drives the riveting head downwardly to rivet the workpiece. The piston rod moves back up, and the lower die plate returns to its original position.