The invention relates to a bucket inner wall on-line self-cleaning device of a packing scale, comprising a scale-bucket upper body, an upper fixed ring, a cleaning wheel, a scale-bucket lower body, a lower fixed ring, an axial rolling wheel, a radial spacing ring, a radial rolling wheel, a transmission case, a driving wheel, a motor and a scraper, wherein the cleaning wheel is supported on the scale-bucket lower body through the radial spacing ring, the axial rolling wheel and the radial rolling wheel and can freely rotate around the central axis of the scale-bucket lower body; the transmission case is fixed on the scale-bucket upper body and the scale-bucket lower body, the motor is fixed on the transmission case, the cleaning wheel is driven by the driving wheel, the scraper is fixedly arranged on the inner side surface of the cleaning wheel, and a dust scraping structure is formed between the scraper and the inner side surface of a bucket body. Because a scale bucket is designed into a split structure and the cleaning wheel is additionally arranged between the scale-bucket upper body and the scale-bucket lower body, when powder-containing adhesive materials are inputted to the scale bucket, because the scraper is driven to constant scrape along the inner side surface of the bucket body by the cleaning wheel, the device ensures that the materials to be packed are not stuck on the inner side surface of the bucket body, thereby ensuring the packing and metering accuracy.