The invention discloses an edge-extended water tank. The water tank comprises a water tank basin body and a water tank table top, wherein the water tank basin body is a concave containing space and is internally provided with a first concave water tank, a second concave water tank, a corresponding first water outlet and a corresponding second water outlet; an edge exceeding the water tank basin body is formed on each of the two sides in the width direction of the water tank table top; and a water blocking table is arranged at the upper part in the length direction of the water tank table top. In the way, the edge-extended water tank is simple in structure and effectively prevents sundries or water from entering gaps in an assembled whole cabinet, thereby improving the cleanliness and the appearance attractiveness of a kitchen.