The invention claims an outer wall heat insulation face brick with a glaze-imitating surface and a preparation method thereof. The outer wall heat insulation face brick consists of a heat insulation layer basal body and a glaze-imitating surface layer integrated with the heat insulation basal body into a whole, wherein the glaze-imitating surface layer is prepared from phthalic anhydride-propanediol resin, silicon oxide particle, Portland cement, silica solution, inorganic short fibre, stearic acid, ammonium persulfate, benzoin, nanoscale titanium oxide superfine micro powder and nanoscale silicon oxide superfine micro powder. The preparation method ensures that the heat insulation layer and a decorative layer are firmly bonded, has high intensity and can effectively prevent the decorative layer from cracking and falling off; and besides, the decorative layer has the advantages of light weight, ageing resistance, long service life, water and moisture protection, good appearance effect, energy saving, environment protection, resource saving, and the like.