The large-scale brand multi-bag filter adopts the side-in and bottom-out method (it can also adopt the bottom-in and bottom-out method). Through the pressure in the pipeline, the filtered liquid medium is pushed or drawn into the filter barrel. The liquid medium to be filtered is filtered through the filter bags supported by the electro-polished perforated support filter cloth, achieving the ideal solid-liquid separation and filtering effect of the liquid medium. It has the characteristics of high throughput, multiple repeated rinsing, long service life, excellent filtration accuracy, low economic cost, etc. It is particularly suitable for pre-filtering and clean filtration.