The invention discloses a mechanical friction type automatic bag opening, clamping and feeding mechanism and a working method thereof. The mechanical friction type automatic bag opening, clamping andfeeding mechanism comprises a front end clamping device, an upper pressing plate, a lower pressing plate, a gear rack transmission device, a rear end clamping device, an electric push rod locking device and an elastic friction sheet; during work, the mechanism provides friction force through relative misplacement among parts to open a sealed opening of a woven bag, and meanwhile, through the frontend clamping device and the rear end clamping device, the opened woven bag is located. The dependence of a pneumatic bag opening device on an external air source is got ridden of, the structure is simple and compact, the functions of opening, clamping and feeding the woven bag can be achieved simultaneously, and the mechanism has the advantages of being high in integrated degree and high in workefficiency.