Waste water filtering device

The utility model discloses a waste water filtering device. The waste water filtering device comprises a filtering box. The filtering box is provided with an upper end cover, a waste water inlet, a first filtering chamber, a second filtering chamber, a third filtering chamber and a waste water outlet. The first filtering chamber is defined by a vertical partition plate arranged between the front wall and the back wall of the filtering box, a primary filtering net arranged between the lower portion of the vertical partition plate and the right wall of the filtering box, the front wall and the back wall jointly. An included angle is formed between the primary filtering net and the horizontal plane. A first sediment outlet is formed in the lowest portion where the primary filtering net is connected with the right wall of the filtering box. A second sediment outlet is formed in the bottom of the second filtering chamber and provided with a timing sediment outlet valve. The timing sediment outlet valve is controlled by a control device. The control device is provided with a timing element. A drawing control wire can be controlled to open the timing sediment outlet valve in a timed mode to carry out timing removing on sediment at the bottom of the second filtering chamber. By means of the waste water filtering device, waste water of a public water room can be effectively filtered to be used for flushing a toilet or other purposes.