The invention provides a
continuous flow preparation method of a
photosensitizer, the
photosensitizer is prepared by using a
continuous flow reaction device, and the
continuous flow reaction device comprises a reaction unit, a post-
treatment unit, a diazotization unit, a chlorination unit and an esterification unit which are communicated in sequence; the preparation method of the
photosensitizer comprises the following steps: conveying a reaction
raw material to a continuous flow reaction device through a feed port, and enabling the reaction
raw material to sequentially flow through a reaction unit and a post-
treatment unit to obtain a first reaction liquid; the first reaction liquid sequentially flows through the diazotization unit, the chlorination unit and the esterification unit through the feeding hole to obtain the photosensitizer; reaction raw materials comprise 2-
naphthylamine-1, 5-disulfonic acid,
solid alkali and a catalyst, the catalyst comprises at least one of 1, 4, 7, 10, 13, 16-hexaoxacyclo-
octadecane, 1, 4, 7, 10, 13-pentaoxacyclo-
pentadecane and dicyclohexane-18-crown (
ether)-6, an esterifying agent comprises at least one of 2, 3, 4-trihydroxy
benzophenone and 2, 3, 4, 4-tetrahydroxy
benzophenone, and the yield and quality of the photosensitizer are improved.