The invention discloses a woven fabric printing flattening device for textiles. The woven fabric printing flattening device comprises a woven fabric, a front press roller set and a rear press roller set. Roller connection frames are mounted at the two ends of the front press roller set and the rear press roller set correspondingly. A transverse frame is mounted on the tops of the roller connectionframes. A flattening mechanism is mounted in the middle of the transverse frame. A flattening frame is mounted on the right side of the flattening mechanism. The flattening mechanism comprises a column cavity; an inner sliding sleeve is connected inside the column cavity in a sleeved mode and fixedly connected to the transverse frame; a spring is arranged inside the inner sliding sleeve; the twoends of the spring are fixedly connected to the inner top of the column cavity and the inner bottom of the inner sliding sleeve correspondingly; a fork-shaped frame is fixedly connected to the bottomof the column cavity, and the fork-shaped frame and the column cavity are integrally formed; a roller and a detachable scraper are mounted at the two tail ends of the fork-shaped frame correspondingly; and a middle abutting roller is mounted under the fork-shaped frame. A sliding groove is formed inside the bottom of the flattening frame and penetrates through the flattening frame, and multiple sets of inner press rollers are arranged on the top wall and the bottom wall inside the sliding groove.