The present invention discloses a bag type filter structure including a filter frame module and filter bags. The filter frame module has a frame edge at each side of the perimeter of the filter frame module, and connecting ribs between two opposite frame edges for partitioning the filter frame module into air inlets. The quantity of filter bags is equal to the quantity of air inlets. Each filter bag includes a bag body and a frame, and the bag body has a mouth, and the frame is a grid frame composed of connecting members and a side frame and connected to the mouth of the bag body for bracing the mouth, and the side frame of the frame is embedded into the air inlet of the filter frame module for mounting the filter bag onto the filter frame module through the frame.