The utility model discloses an impeller type water tap with the function of automatical delay closing and water saving. When the water tap is opened by using a push rod, the impeller is pushed by the water pressure and the water stream pushing force, which makes the flange on the circumference of the turbine move or do a rectilinear motion, and the goal of automatical delay closing is achieved. Compared with the common water tap, the utility model can save water, avoid the real water problem. The utility model has the advantages of convenient and sanitary use, strong versatility, easy standardization and serialization.