The invention relates to a water tap valve core which comprises a fixed valve plate, a first movable valve plate and a second movable valve plate, wherein the second movable valve plate is arranged between the first movable valve plate and the fixed valve plate; both end surfaces of the second movable valve plate are respectively attached to the corresponding end surfaces of the first movable valve plate and the fixed valve plate in sealing mode; the fixed valve plate is provided with a fixed valve middle part water passing port and a fixed valve side part water passing port; the first movable valve plate is provided with a fixed movable valve middle part water passing port; the second movable valve plate is provided with a second movable valve middle part water passing port and a second movable valve side part water passing port; the first movable valve plate rotates, so that the first movable valve middle part water passing port and the second movable valve middle part water passing port are open or closed; and the second movable valve plate rotates, so that the second movable valve side part water passing port and the fixed valve side part water passing port are open or closed. The water tap valve core provided by the technical scheme is simple for product component processing, ensures the quality, and has perfect functions.