Ordinary packaging adhesives are prone to failure in humid and rainy environments, while waterproof hot melt glue solves the moisture-proof and waterproof bonding demands of special packaging. The cured hot melt glue layer has excellent water resistance and will not soften or degum after contacting with water vapor and liquid water. It is suitable for outdoor transportation packaging, wet environment storage cartons and daily chemical product packaging. It effectively prevents packaging cracking and structural loosening caused by moisture absorption. The adhesive maintains stable bonding strength in high-humidity workshops and rainy logistics links, protecting internal products from moisture damage. It is an essential adhesive solution for packaging products with high moisture-proof requirements.