The invention discloses a water dispenser, which comprises a power device, a water tank and a first semiconductor refrigerating sheet, and further comprises a heating cavity and a hot water path, wherein the first semiconductor refrigerating sheet is connected to the power device; a positive/negative electrode conversion switch is connected between the first semiconductor refrigerating sheet and the power device; a water inlet is formed in the top of the water tank; the water inlet comprises an outer tube and an inner tube; both the inner tube and the outer tube are of telescopic tube structures; one end of the outer tube is internally sealed, and an opening in the other end of the outer tube sleeves outside the inner tube; a spiral slideway is arranged in the outer tube; one end of the outer tube is fixed to the internally sealed end of the outer tube and the other end of the outer tube extends into the inner tube; the heating cavity is arranged at the lower side of a water inlet cavity and communicates with the water inlet cavity; a heating wire is arranged in the heating cavity; the hot water path is provided with a hot water valve and is used for discharging hot water; and the hot water path comprises an insulating cavity which is arranged at the lower side of the heating cavity and communicates with the heating cavity by virtue of a drainage valve of the heating cavity. The water dispenser provided by the invention is reasonable in structure, short in time and high in efficiency; and the water dispenser is especially applicable to home use and office use.