A switching valve core for water shutoff, which comprises a valve core body, the valve core body being provided with a water inlet and a water outlet; the water inlet and the water outlet being connected to form a flow channel; the valve core body being provided with an accommodating cavity along its axial direction; wherein an interior of the accommodating cavity is provided with an operating member, a water shutoff member and a water output switching member; wherein the operating member comprises a pressing water shutoff member and a rotatable switching member that are provided independently from each other; the pressing water shutoff member being movable along an axial direction of the accommodating cavity, and the tail end of the pressing water shutoff member abutting against or being separated from a pressure relief hole of the water shutoff member; wherein the water shutoff member is provided with a water shutoff cavity, in which a fixing seat is placed; a sealing sheet being disposed on the fixing seat, and a water sealing portion facing the sealing sheet being disposed in the flow channel; wherein the fixing seat and the sealing sheet are provided with a through hole communicating with the water inlet and the water shutoff cavity at corresponding positions; wherein the fixing seat is further provided with the pressure relief hole connecting the water outlet and the water shutoff cavity; wherein, when the end of the pressing water shutoff member is sealed against the pressure relief hole, the water in the water shutoff cavity presses down the sealing sheet along the axial direction to seal the water sealing portion; wherein, when the end of the pressing water shutoff member is separated from the pressure relief hole, the water under the sealing sheet pushes the sealing sheet upward along the axis to be separated from the water sealing portion; wherein the rotatable switching member and the water output switching member are provided in a linkage manner; wherein the water output switching member comprises a movable ceramic sheet and a fixed ceramic sheet mounted on the water outlet; the movable ceramic sheet being arranged in conjunction with the rotatable switching member; characterized in that the pressing water shutoff member comprises a ballpoint pen pressing mechanism and a pressing rod connected with it, the end of the pressing rod being connected with a guiding cylinder; the guiding cylinder being provided with a drainage cavity connected with the water shutoff cavity, one end of the guiding cylinder being sleeved at the end of pressing rod and its other end being sleeved outside a pole; the end of the pole being exposed outside the pressing rod and connected with a sealing sleeve; the pressing water shutoff member and the fixing seat are provided with lifting portions abutting each other, wherein, in the process of the pressing water shutoff member moving upward along the axis, the lifting portions are abutting against each other, so that the pressing water shutoff member drives the fixing seat to move upward; and wherein the lifting portions comprise a first abutting block disposed on an outer circumference of the guiding cylinder and a second abutting block disposed on the fixing seat, wherein, when the sealing sleeve seals the pressure relief hole of the fixing seat, the second abutting block is located above the first abutting block and in the same vertical plane.