Multi-stage filtering device for water plant

The utility model discloses a multi-stage filtering device for a water plant, which comprises a first filtering box, a second filtering box arranged on the right side surface of the first filtering box, a first water pipe arranged on the surface of the first filtering box, a third filtering box arranged on the right side surface of the second filtering box, and multi-stage filtering and purifying of water through the first filtering box, the second filtering box and the third filtering box. A first filter screen and a motor are installed in the first filter box, a rotating rod is installed on the surface of the first filter screen, a brush strip is arranged at the lower end of the rotating rod and abuts against the lower surface of the first filter screen, the output end of the motor is connected with the upper end of the rotating rod, and a second filter screen is installed in the second filter box and abuts against the lower surface of the second filter screen. A third filter screen is arranged in the third