Preparation method of novel softener highly resistant to phenolic yellowing

The invention discloses a preparation method of a novel softener highly resistant to phenolic yellowing. The preparation method includes subjecting long-chain fatty acid or long-chain fatty acid ester, diethanolamine and a catalyst, which serve as raw materials, to esterification (interesterification) reaction so as to obtain a corresponding fatty chain ester (acylamide) intermediate; selecting appropriate organic acid to neutralize so as to obtain a weak cationic softener; continuing to perform quaternization so as to synthesize a cationic softener; adding a cross-linking agent for crosslinking support reaction so as to obtain a softener excellent in hand feeling. The phenolic yellowing resistance of the three softeners can be above Grade IV and are capable of meeting the requirements of clients on phenolic yellowing resistance and hand feeling, thereby being bright in market prospect.