The invention relates to an environment-friendly building simulated tile coating and a preparation method thereof, and belongs to building materials. The environment-friendly building simulated tile coating is used for the decoration of surfaces of outer walls of buildings, and the defects of high possibility of dropping, large dead height of tiles and high cost in the conventional tile system are overcome. The environment-friendly building simulated tile coating consists of water, titanium dioxide, colorful sand and a dispersing agent, 2 weight percent of cellulose ether aqueous solution, a pure acrylic emulsion, ethanediol, a thickening agent, a film-forming aid, a defoamer, a preservative, a pH regulator and a multifunctional aid in a specific weight ratio. The preparation method comprises the following steps of: mixing liquid materials uniformly, mixing solid materials uniformly, adding the uniformly-mixed solid materials into the uniformly-mixed liquid materials slowly, and stirring uniformly to obtain the environment-friendly building simulated tile coating. The environment-friendly building simulated tile coating has a vivid tile visual effect and is diversified in colors, simple and tasteful, high in contractibility resistance, resistant to aging, long in service life, non-toxic and tasteless, and environmental protection is facilitated; and the environment-friendly building simulated tile coating can be constructed at the temperature of -5 DEG C, and compared with like products, the environment-friendly building simulated tile coating has the advantage that the construction period can be prolonged by one month.