Self-cleaning bag filtering machine

The utility model relates to a self-cleaning bag filtering machine. The main technical proposal of the utility model is that a motor is arranged on the bottom of a casing to be connected with a speed reducer; the output shaft of the speed reducer is connected with a cleaning vane; a filtering cylinder is arranged in the cylinder body of the casing; the filtering cylinder is hung on a stream-merging box; both sides of the body of the box are connected with a liquid-entering valve, a liquid-discharging valve, a circulating valve, a liquid-returning valve, a slag-discharging valve and an air-containing tank through pipelines. The utility model has the advantages that the utility model reduces the manufacturing cost of the device and increases the productivity and filtering area; the utility model is convenient to repair and install; the utility model realizes automatic and smooth control.