Combined type filter for water and fertilizer integration and operation technology of combined type filter

The invention discloses a combined type filter for water and fertilizer integration and an operation technology of the combined type filter. The filter comprises a filter box, a solid fertilizer watertank, a liquid fertilizer water tank and pipelines, wherein the filter box is connected with the solid fertilizer water tank and the liquid fertilizer water tank separately through the pipelines. According to the application characteristics of a filtering device and a fertilizer applicator in water and fertilizer integration in modern agricultural production, the combined type filter for water and fertilizer integration organically combines the fertilizer applicator and the filtering device, and the differential pressure produced by the filtering device is used as a power source of the fertilizer applicator. The pressure of the filtering device is transferred to fertilizer application water tanks through pipelines, the energy loss of a system is utilized, the flow of the fertilizer application water tanks is cont