Water flushing one-way water exhaust device

The utility model discloses a long cylindrical water flushing one-way water exhaust device with no water seal structure, which is vertically inserted into a drainage pipeline. A shaft which is arranged on a horizontal center axis of the bottom of a valve cylinder is hinged with a valve plate provided with a sealing port. A permanent magnet arranged in the middle part of the valve plate is attracted with a height-adjustable soft-magnetic bolt arranged on an inner pillar of the valve cylinder in order to make the valve plate seal a valve port closely and prevent bad odor, poisonous substance, insects and overflow; meanwhile, the utility model avoids the phenomenon that the drainage pipeline is blocked by sediment because of small water stream. When the water level is higher than a set height, the valve plate can be opened automatically and immediately to produce water flushing. The utility model is helpful for pipeline cleaning, and the pipeline is not easy to block. The utility model can automatically complement air to the drainage pipeline, and can obtain the operating condition of a floor drain at any time.