The utility model discloses a device capable of uniformly distributing water, which comprises a water distribution channel, an adjustable weir plate, a water distribution groove and a water distribution branch pipe, a plurality of groups of water outlets are sequentially arranged on the inner wall of the water distribution channel along the water inlet direction, and each group of water outlets consists of two water outlets which are symmetrically arranged on two sides of the water distribution channel; each water outlet is communicated with the corresponding water distribution groove in a one-to-one correspondence mode, each water outlet is provided with an adjustable weir plate, the adjustable weir plates are connected with the inner wall of the water distribution channel in a sliding mode, the adjustable weir plates can move in the height direction of the water distribution channel, and the lower ends of the adjustable weir plates protrude out of the lower ends of the water outlets;a V-shaped overflow groove is formed in the upper portion of the adjustable weir plate, and scale marks are arranged on the inclined face of the overflow groove. The uniform water distribution devicenot only can quantify the water distribution amount, but also can realize uniform water distribution of each water distribution tank, and is simple in structure, convenient to maintain, low in construction cost and convenient to popularize on a large scale, and the problems of leakage and the like of a water distribution system can be reduced.