The invention discloses after treatment accessory ingredient used for hair product machining. The after treatment accessory ingredient is characterized by comprising the following ingredients in parts by weight: 1-5% of didodecyl carbonate, 1-5% of dodecyl glycoside, 1-5% of quaternary ammonium salt, 10-20% of simethicone emulsion, 5-10% of amino silicon oil emulsion and 60-80% of deionized water. The after treatment accessory ingredient to which the invention relates has the advantages of easiness in dilution, low cost and simple use technology, the hair product subjected to after treatment has the advantages of excellent smoothness and antistatic property, high toughness and nature gloss.