The invention discloses a water faucet with a hidden valve core. The water faucet comprises a water faucet casing and the valve core, wherein the valve core is arranged in the water faucet casing; the water faucet casing is provided with a fixing surface; the fixing surface can be attached onto a table top; the water faucet casing is divided into an upper part and a lower part by using the fixing surface as a boundary; the valve core is arranged at the lower part of the water faucet casing; the upper part of the water faucet casing is of a cavity structure; the top end of the water faucet casing is provided with a handle; the handle is connected with the valve core through a connecting rod and controls the valve core; the valve core comprises a first sealing sheet and a second sealing sheet; the first sealing sheet and the second sealing sheet are tightly attached; cold and hot water inlet holes are formed in the second sealing sheet; arc-shaped holes are formed in the first sealing sheet; the first sealing sheet is connected with the connecting rod, and can do plane rotation relative to the second sealing sheet, and the second sealing sheet is fixedly arranged on the valve core and is relatively still to the water faucet casing. The water faucet has the advantages that the valve core is arranged under the table top, and during the design of the water faucet, the dimension of the valve core does not need to be considered; the water faucet can be widely applied to ultra-thin washing basin water faucet products; the faucet casing is of a cavity, the manufacturing process is simple, and the qualification rate is high.