A matte solid watercolor paint is characterized in that it comprises dispersant, syrup, dextrin, starch, glue, bactericidal and antifungal agent, polyethylene glycol, filler, toner and functional auxiliary, the components are mixed and stirred evenly, and finally Under the condition that the extrusion temperature of the extruder is 18-25° C., different shapes of matte solid watercolors are obtained. The invention also discloses a preparation method of the matte solid watercolor paint, which comprises the steps of stirring, refining, and extrusion molding. The matte solid watercolor paint obtained by the invention has the advantages of no moisture, uniform pigment diffusion, fineness, no graininess and no water marks, and meanwhile, the preparation method is simple and easy to realize.