Color paste used for preparing whiteboard marker ink and preparation method thereof

The invention provides color paste used for preparing whiteboard marker ink. The color paste comprises the following components in percentage by weight: 1-15% of a film-forming agent, 1-30% of a coloring agent, 60-90% of a solvent, and 0.1-5% of a dispersing agent, wherein the film-forming agent comprises one of polyvinyl alcohol, polyvinyl acetal, ethyecellulose, carboxymethyl cellulose and hydroxyethyl cellulose; and the dispersing agent comprises one of an acrylic block type dispersing agent, a polyester type dispersing agent, and an amino-acid ester copolymer type dispersing agent. Furthermore, the invention provides a preparation method of the color paste. By virtue of interaction of the coloring agent, the film-forming agent and the dispersing agent in the color paste, coloring agent particles can be coated in the film-forming agent very well after pre-dispersing and grinding processes under special conditions; the color paste system has better stability, the coloring agent can be dispersed more uniformly and has relatively small grain size; the preparation method can be used for preparing the whiteboard marker ink with good comprehensive properties.