Bag filter is multi-purpose filtering equipment with features of compact closed structure, simple operation, energy saving and high efficiency. It is a kind of pressure type filtering device mainly consisting of filter body, quick-opening filter cover, stainless steel filter bag reinforcing mesh and other main components. The filtrate flows into the filter bag by the side inlet pipe of the filter shell. The filter bag is installed in the reinforcing mesh basket. The qualified filtrate can be obtained by the liquid flowing through the filter bag with required fineness, and the impurity particles are blocked. Bag filter is very convenient to change the filter bag, there is no material consumption in filtration process.