The invention relates to the technical field of chemical materials and discloses a dedicated waterproof adhesive for nonwoven fabrics. According to the dedicated waterproof adhesive, environment-friendly polyvinyl acetate is utilized as a main body, and the problems that water resistance, cold resistance, heat resistance, corrosion resistance, mechanical stability and the like of the polyvinyl acetate are all very poor are solved by modification; water resistance of the prepared adhesive is extremely good, and cohesiveness is improved by 10 times or more; silicon dioxide gel and hydroxyethyl methylcellulose are utilized to be compounded, the advantages of inorganic materials and polymer are combined by a modifier which is prepared by silanization treatment, a synergistic effect is played,and mechanical properties of cohesion, bonding strength and the like are improved; meanwhile, durability and toughness are also improved. The bonding strength of the dedicated waterproof adhesive disclosed by the invention is obviously improved, glue materials are greatly saved, the construction efficiency is improved, labor cost is reduced, and the practical significance in improving applicationproperty, cohesiveness, crack resistance, water resistance and weather resistance of the nonwoven adhesive is achieved; thus, the dedicated waterproof adhesive is a technical scheme worth of being popularizing and applying.