Process for preparing iron blue with fantastic color effect

The invention relates to a process for preparing iron blue with fantastic color effect, and belongs to preparation of strong interference pigments of multi-coated laminar base materials. Ferrous cyanide, trivalent ferric salt and transparent laminar base material are used as raw materials in the iron blue pigment with fantastic color effect; and the process comprises the following steps of: continuously stirring the raw materials at the temperature of between 10 and 70 DEG C, and precipitating reactants of certain concentration on the transparent laminar base material to obtain an iron blue coated fantastic color effect pigment. Different iron blue color phases are obtained by changing reaction parameters, and then a finished product is obtained by filtering, washing and drying. The process has the advantages of reasonability in design, simplicity in production process, low pollution and low equipment cost and energy consumption.