The invention relates to a preparation method of composite pigment with the surface coated with phthalocyanine blue, and belongs to the technical field of pigment. The preparation method is based on electrostatic interaction, copper phthalocyanine with opposite charges and a laminar oxyhydrate nano-material which has a similar hydrotalcite structure are directly co-assembled to obtain a laminar nano composite material, copper phthalocyanine molecules and a laminar oxyhydrate layer are in monomolecular layer vertical arrangement, interlayer spacing of laminar oxyhydrate is increased so that reaction space of the laminar oxyhydrate is large, more active centers are exposed, the ability of binding between the laminar oxyhydrate and pigment is increased, large-scale polymerization among particles in a storage process is prevented, and dispersibility and compatibility are improved; and the preparation method is short in production process, low in energy consumption and low in environmentalpollution, products can be directly applied to a preparation process of printing ink, the products can be compounded with various pigments, the color, ink color, color strength and transparency of theproducts are equivalent to those of pigment obtained by a vertical ball-milling method, and the composite pigment is high in chemical stability, good in color brightness and complete in chromatography.