The invention relates to a post-treatment method for a cyclotriphosphazene compound product with a hydroxyl structure, and mainly solves the problem of a large quantity of residues of triethylamine hydrochloride or pyridinium chloride and acid substances in the prior art. The technical scheme is adopted as follows: the post-treatment method for the cyclotriphosphazene compound product with the hydroxyl structure comprises the following steps: removing the triethylamine hydrochloride or the pyridinium chloride in a coarse product containing a cyclotriphosphazene compound with 1-6 hydroxyl structures, the triethylamine hydrochloride or the pyridinium chloride, tetrahydrofuran and water in a suction filtration manner; washing by using an alkaline solution of which the pH is 7-12, and then removing the tetrahydrofuran and the water by adopting a distillation or rectification method; adding methanol for dissolving; removing settled solid impurities in the suction filtration manner; removing the methanol from filtrate by distillation or rectification, so as to obtain a pure product of the cyclotriphosphazene compound product with the hydroxyl structure. By adopting the method, the problems in the prior art can be well solved. The post-treatment method can be applied to post-treatment on the cyclotriphosphazene compound product.