The invention relates to a coal boiler burning-auxiliary dust cleaner which can fully burn the coal and solve the black smoke problem of chimney with energy-saving effect and reducing the soot Ringlemann less than 1 level. It comprises an ejection cylinder, an ejector, wind adjusting gate, a steam three-through, a case, a steam adjusting rod and a steam pipe connected to the steam division cylinder via pipeline. It is characterized in that: the steam three-through is mounted inside the case; the ejection cylinder is mounted at the front end of case; the wall of case has cooling wind hole; one end of steam three-through is connected to the steam pipe while another end is connected to the ejection cylinder; the back end face of ejection cylinder is the flange, which has a wind inlet, and its center has a ejector; and the ejector has a nozzle. The invention can apply variable coal boilers with environment-friendly and energy-saving effects. |