Preparation method and continuous preparation system of isoindoline pigment

The invention provides a preparation method and a continuous preparation system of isoindoline pigments. The method comprises the following steps: (1) premixing: uniformly stirring and mixing isoindoline, barbituric acid raw materials, glacial acetic acid and water to obtain premixed slurry; (2) preparing a pigment crude product: introducing the premixed slurry into a first pipeline reactor, and then introducing a product obtained by the first pipeline reactor into a second pipeline reactor to obtain the pigment crude product; and (3) pigmentation: introducing the pigment crude product into a delayed pipeline reactor to obtain the isoindoline pigment. The continuous preparation system comprises a stirring device, a first pipeline reactor, a second pipeline reactor, a buffer tank and a delay pipeline reactor. According to the invention, the pipeline reactor is used for the synthesis reaction, so that the reaction steps and the reaction time can be reduced, continuous production is realized, and the production