Provided is an automatic cutting and sewing machine for woven bags. A feeding device is connected with a storage device which is connected with a material conveying device, the material conveying device is connected with a cutting device which is connected with a transferring device, and the transferring device is connected with a sewing device which is connected with a stacking device. A material roll alignment device is arranged below the feeding device; the material conveying device is composed of two material conveying rollers which clamp material sheets to convey materials in a rotating mode, and a color mark type in-place detection device is arranged in the upstream process of material conveying; a pressing bar is arranged between the cutting device and the material conveying device, and a hot cutting opening twisting-open device is arranged between the pressing bar and the cutting device; the material conveying device is a two-way conveying device, and the two ends of the two-way conveying device are connected with the sewing device and the stacking device respectively; a pressing claw of the material transferring device is an elastic pressing claw. In the upstream process of sewing, a front posture adjusting device is arranged. The automatic cutting and sewing machine for woven bags is reasonable in design, compact in structure, capable of saving raw materials and saving time and labor and high in work efficiency, and line production is smooth.