The equipment is multi-layer frame filter, which is applicable to the process operation with requir-ements of fine filtration and semi-fine filtration such as purification, sterilization and defecation with sealed filtration in the liquid with low viscosity and little slagging content under the concentration of 50%, By directly adopting micro porous filtration film, it can realize the sterile filtration without p-assing the micro porous film. The equipment has characteristics such as large filtration area, large flow and wide applicable range , so it is widely used in the fields of pharmacy , chemical industry and food etc. The effect will be better if used for filtration of injection liquid medicine in pharmacy factories.