A slider and a zipper comprising the slider. The slider comprises a pull tab, a slider body, and a safety catch; the slider body is provided with an upper base plate and a lower base plate; the upper base plate is provided with a rear rivet body set and a front rivet body set which are arranged in a corresponding manner; when the pull tab is rotated and contacts the front rivet body set, the front rivet body set contacts a side column of the pull tab to block the overturn of the pull tab. The front rivet body set applies a force on the rotated pull tab, such that the pull tab is rebounded to the rear end of the slider with a horizontal part as a rotating axis, and the safety catch is locked downwards to lock the zipper.