Glass fiber impregnating compound as well as preparation method, product and application thereof

The invention provides a glass fiber impregnating compound, which comprises effective components and water, the effective components comprise a silane coupling agent, a film-forming agent, a lubricant, a leveling agent and a pH value regulator, the solid content of the impregnating compound is 5-10%, and the water content of the impregnating compound is 5-10%. The impregnating compound comprises the following effective components in percentage by mass: 7-20% of the silane coupling agent, 9-20% of the lubricant, 1-5% of the flatting agent, 50-80% of the film-forming agent and 3-6% of the pH value regulator, wherein the mass of the silane coupling agent accounts for 7-20% of the total mass of the impregnating compound. The film-forming agent is a mixture of a film-forming agent A, a film-forming agent B and a film-forming agent C, the film-forming agent A is a water-based saturated polyester emulsion, the film-forming agent B is a water-based saturated polyester modified acrylic resin emulsion, and the film-for