A bucket cover comprises an outer ring and an inner ring. A valve element comprises a floating body and a second magnetic acting body (S112) which can be controlled by magnetic force, density of the floating body is smaller than that of water, and the floating force is greater than gravity borne by the valve element. According to a bucket mouth of a water bucket, a limiting body is arranged in an inner cavity space of the bucket mouth, and the limiting body does not seal the inner wall of the bucket mouth. A bucket base comprises a body and a magnetic body, and the body is in the shape of a hollow bucket; a water outlet (S32) is formed in the bottom of the body, the magnetic body is fixedly connected with the body, and magnetic force of the magnetic body has a component in the axial direction of the body. A container is matched with the bucket base for use. A water bucket is provided with the bucket cover, the valve element (S11) and the bucket mouth. A water dispenser is provided with the bucket base. The water dispenser is provided with the bucket base and the container. The water bucket can effectively solve the problem that the water bucket drips water and is difficult to recycle.