The invention discloses an alkali-free reinforced treating compound used for glass fiber, which is composed of methyl ester orthosilicate, water-soluble polyester, polyurethane, Gamma-aminopropyl-triethoxysilane, Gamma-propyl-trimethoxysilane, water and paraffin emulsion according to percentage by weight; the treating compound is prepared through adding different ingredients step by step for diluting and mixing, wherein, methyl ester orthosilicate, water soluble polyester and polyurethane mainly play the function of filming; Gamma-aminopropyl-triethoxysilane and Gamma-propyl-trimethoxysilane serve as coupling agents; a good branched chain can be formed in the mixed solution, thereby enabling the compatibility of the mixed solution to be better; and paraffin wax is used as an emulsion to have good lubricating effect. The treating compound can be adopted to improve the tensile force of the glass fiber and provide raw material guarantee for certain glass fiber textile products with high strength requirement, and the reinforcing materials, such as the raw fabrics of grinding wheels and web clothes, and the like, are manufactured through the method.