Multi-fold filter bag device

The utility model discloses a multi-fold filter bag device which comprises a bag body, a bag head, a back cover, a fixing spring, a fixing piece, a fixing band and an elastic surface strip, the upper end of the bag body is connected with the bag head in a sewing mode, the lower end of the bag body is connected with the back cover in a sewing mode, the fixing spring is fixedly arranged on the bag body, and the fixing piece is arranged on the back cover. A fixing spring is arranged on the bag body, the fixing spring is fixed with the bag body through a fixing piece, the bag head is composed of elastic surface strips and threaded rods, the elastic surface strips define a circular ring in a riveting mode, a circle of threaded rods are arranged on the outer surfaces of the elastic surface strips in a bonding mode, and annular grooves are formed in the threaded rods along the outer circumferences of the elastic surface strips. The dust removal device is simple in structure and high in practicability, the wrinkles a