The utility model relates to an automatically-positioning transverse belt type conveying device for conveying materials, which comprises a frame, a driving roll, a driven roll and a conveyor belt. The driving roll, the driven roll and the corresponding conveyor belt are rotatably mounted on the frame, at least one positioning strip is arranged on one side of the conveyor belt facing the driving roll and the driven roll, each of the driving roll and the driven roll comprises a roll shaft and roll segments axially mounted at intervals at two ends of the roll shaft, guide wheels are mounted in the middles of the roll shaft of the driving roll and/or the driven roll, and the surface of each guide wheel is provided with guide grooves matched with the positioning strips. By means of the automatically-positioning transverse belt type conveying device for conveying materials, manufacturing cost is reduced while the problem of deviation of the belt type conveying device during conveying is solved, and the problem of high manufacturing cost of existing belt type conveying devices with guide grooves is solved.