The invention relates to a multi-bag type filter which comprises an upper box, a lower box, filter bags and a deashing mechanism, wherein the bottom end of the upper box is communicated with the upper end of the lower box, the filter bags are arranged in the upper box, an arbitrary filter bag is a double-layer filter bag, the lower ends of the filter bags are connected with the bottom end of the upper box, the deashing mechanism comprises a driving arm, a sliding block and a guide rod, wherein the guide rod is fixedly arranged between the top end and the bottom end of the upper box along the axial center of the upper box, the sliding block is sleeved on the guide rod and connected with the upper ends of the filter bags, and the upper end of the driving arm is connected with the sliding block; the lower end of the driving arm is connected with the upper end of a rocking rod through a pin shaft, the lower end of the rocking rod is connected with a driving shaft, and the driving shaft is connected with the bottom end of the upper box through a bearing. The double-layer filter bags are arranged in the filter and are compressed by using the mechanical deashing mechanism, therefore, the specific surface area of the filter bags is increased, the efficiency of the filter is improved, and small particles left between the inner-layer filter bag and the outer-layer filter bag can be conveniently cleaned.