Filtering device

The utility model discloses a filtering device which adopts at least two filtering water tanks which are standby in parallel to each other to filter waste liquid generated by a production process machine, so that when the working filtering water tank needs to be cleaned or maintained, other filtering water tanks can continue to work; in addition, two stages of filtering units are arranged in each filtering water tank, the first-stage filtering unit is used for filtering the particle impurities in the waste liquid, and the first baffles and the second baffles which are sequentially and alternately arranged at intervals in the second-stage filtering unit form an up-and-down flow channel, so that the particle impurities and the oil stains in the waste liquid can be filtered continuously and continuously; the oil and water in the waste liquid are separated, and floating oil in the waste liquid is filtered, that is, two stages of filtering units are arranged to fully filter particle impurities and oil stains in th