Automatic backwash irrigation filtering device

The utility model relates to an automatic backwash irrigation filtering device which comprises a quantity filter, a backwash water storage tank and a controller, a water outlet of the filter is respectively connected with a water conveying pipe and a backwash water inlet pipe through a three-way joint, and the water outlet pipe of the backwash water storage tank is communicated with a filtering water inlet pipe of the filter. A pressure gauge and a blow-down valve are arranged on the filter; and the pressure gauge and the blow-down valve are respectively connected with the controller. By adopting the structure of the two filters and the backwash water tank, the backwash water tank is filled with filtered water at the beginning of irrigation, and when one filter needs to be cleaned, the other filter normally filters the water and backwashes the filter needing to be cleaned by utilizing the water in the backwash pipe at the same time, so that the backwash effect of the filter is improved. On one hand, the requi