The invention discloses a back pressure type water power and water level control valve, which is applied to a water inlet tube of a pool and a water tank for realizing automatic on-and-off control and is composed of valve bodies (1, 2), an upper valve cover (3), a lower valve cover (4), a valve rod (5), a valve plate (6) and soft membranes (8, 9, 10).Compared with the water level control valve ofthe same type, the water level control valve of the invention has the outstanding advantages of adopting original floating-ball-free and quick-wear-part-free structure, greatly improving reliability and service life and enjoying lower production cost, simple and convenient maintenance, realizing maintenance outside the pool or the water tank and being capable of completely avoiding secondary pollution to water quality.