The inner bag of the double-layer water-soluble bag is composed of a fully water-soluble bag. When the water temperature reaches the water-soluble temperature, the bag will be completely dissolved in water. The outer bag is composed of a semi-water-soluble bag. During use, the PVA water-soluble strips attached to the bag and The water-soluble line that binds the mouth will completely dissolve in the water. After the laundry process is over, the HDPE/LDPE bags containing the clothes need to be collected for recyclability. The double-layer design makes the bag stronger and more load-bearing, and the inner bag is attached with a water-soluble rope, which is easy to pull and is used to bind the seal of the laundry bag.