The method of preventing and eliminating discolor of 3-chloropropylene product is to add proper amount of compound containing epoxy radical during or after 3-chloropropylene producing process, so as to eliminate free acid from the product and convert Fe ion, Cr ion, Ni ion and other metal ions generated in acid corrosion into colorless complex. The added compound containing epoxy radical has very small amount and thus no influence on the product performance and application.