A cloth washing device contains a washing machine and a fiber opener. The washing machine includes multiple transmission rollers arranged on water and multiple bearings fixed in the water. The fiber opener includes multiple transmission rollers arranged on the water, multiple bearings fixed in the water, and at least two mesh wheels arranged in the water. The fiber opener is mounted behind the washing machine, and a cloth is delivered between the washing machine and the fiber opener by way of the multiple transmission rollers and the multiple bearings of the washing machine and the fiber opener and the least two mesh wheels.