The invention relates to an automatic powdering box for the anode of a secondary battery, which comprises a box body; a powder inlet box guide wheel is arranged in the box body; a first coarse coarse brush, a second coarse hard brush, a first soft brush and a second soft brush are arranged above the powder inlet box guide wheel; the end parts of a first rotating shaft, a third rotating shaft and a fourth rotating shaft are all provided with driven sprockets, and a drive sprocket and a first tension sprocket are arranged below one end of the first rotating shaft; the drive sprocket is connected with the driven sprockets corresponding to the first rotating shaft, the third rotating shaft and the fourth rotating shaft by using a first chain; and one end of a second rotating shaft away from the drive sprocket is provided with a driven sprocket, the lower part of the second rotating shaft corresponding to the driven sprocket is provided with a second tension sprocket, and the second tension sprocket is connected with the driven sprockets corresponding to the first rotating shaft and the second rotating shaft by using a second chain. The invention has simple structure, is convenient to maintain, shortens the technological process of anode film production, improves the production efficiency, and reduces the production cost.