Abstract: In a continuous treating system for a wide cloth which continuously treats the wide cloth while the cloth is being conveyed and passed through a treating tank by a conveyor disposed inside the treating tank, the improvement wherein zigzag motion is applied to a single endless conveyor itself along the rotation of the conveyor and a guide member such as a net or a guide bar is stretched along the zone of the zigzag movement of the conveyor in such a manner that the cloth is passed through the zone; and a treating liquid is jetted to the cloth inside the zigzag movement zone from both sides of the cloth.