Automatic powder filling device and method for product powder bin

The invention relates to an automatic powder filling device and method for a product powder bin, a powder filling opening is formed in the upper portion of the powder bin, the powder filling device comprises a conveying mechanism, an assembling mechanism, a powder filling mechanism, a vibrating mechanism, a feeding station, a cover disassembling mechanism and a cover body backflow track, and the conveying mechanism comprises a carrier; the assembling mechanism is used for covering the carrier with the cover body and fixing the cover body and the carrier, the cover body is provided with a containing cavity and a powder outlet which is formed in the lower portion and communicated with the containing cavity, when the carrier is covered with the cover body, the powder outlet is located above the powder filling opening, and the powder outlet and the powder filling opening correspond in position and are communicated with each other; the powder filling mechanism is used for filling powder into the accommodating cavi