The invention discloses a demolding agent for glass panel vacuum film plating. The demolding agent comprises the following components in percentage by weight: 15-20% of cosolvent, 8-10% of builder, 4-6% of permeating agent, 9-12% of chelating agent, 7-11% of organic base, and the balance of water, wherein the permeating agent comprises the following components in percentage by weight: 1-2% of alkyl polyglucoside, 1-2% of dodecyl dimethyl betaine, and 1-2% of succinic acid di-sec-octyl ester sulfonate. Compared with the prior art, the demolding agent applies the effects of wetting, emulsification, compatibilization, dispersion and washing of all the components to achieve the multifunctional compound performance, is high in dirt removing capacity on various vacuum plating films and adhesive films, is thorough in removal, is free of corrosion, scratch and rubbing on glass, is low in reject ratio of continuous operation, is excellent in stability, is nearly neutral without poison, harm, excessive erosion and hydrogen permeation, achieves the biodegradability, improves the dirt removing efficiency, and reduces the environmental pollution.