The invention discloses an ash removing device for deposited ash for boiler bellows. The ash removing device comprises ash removing plates, ash removing holes, detection tracks, detectors, and an ashcollecting device, wherein the ash removing plates are arranged below a burner in the same layer in the bellows; each ash removing plate is provided with an ash removing hole being adjustable to closeand open, and used for allowing falling down of ash; the detection tracks are used for being jointed to the side walls of the bellows and respectively extent along the length direction and the thickness direction of the dust removing plates; each detector for detecting the height of deposited ash on the upper surface of the corresponding ash removing plate is in sliding connection to the inner part of the corresponding detection track; the ash removing holes are in communication when the height of the deposed ash obtained by the corresponding detector is greater than preset height; and the ash collecting device for collecting ash falling down from the ash removing holes is arranged below the ash removing plate at the bottom of the bellows. According to the ash removing device for deposited ash for boiler bellows, the ash removing holes are used for realizing communication and disconnection of cavities of the bellows above the ash removing plates with the ash collecting device, the condition that during an ash removing operation, the ash removing device for deposited ash for boiler bellows has a large ash removing area, can be guaranteed, improvement of ventilation resistance of secondary air is also avoided, and the ash removing device has the characteristics of being high in reliability, low in energy consumption and high in feasibility.