The invention relates to a technology for preparing packaged woven bag tube materials into woven bags, in particular to a woven bag cutting device with a widthwise mouth rubbing device. The woven bag cutting device with the widthwise mouth rubbing device comprises a rack, a rubbing drive part, a rubbing guide part, an upper mouth rubbing part, a lower mouth rubbing part, a pressing drive part, a pressing guide part, a thermal cutting part and a thermal cutting and mounting part. According to the woven bag cutting device, the woven bags are cut by the thermal cutting part; the thermally-cut woven bag mouths are rubbed by the widthwise mouth rubbing device in the widthwise direction of the woven bags after the woven bags are cut, so that openings of the thermally-cut woven bag mouths are clear, and the two layers of the woven bags are not adhered with one another any more; in a woven bag manufacturing device, the woven bag cutting device is utilized for manufacturing the woven bags, so that adhesion, caused by fusing of woven bag materials during thermal cutting, between two layers of the woven bags at openings can be avoided, and therefore, woven bags taken by later-stage packaging equipment are automatically opened conveniently.