The invention relates to a high-reflectivity glass bead and a preparation method thereof. The high-reflectivity glass bead is characterized in that the surface of the glass bead is covered with a plating layer which is prepared through film plating liquid, wherein the film plating liquid is prepared through the following raw materials in parts by volume: 3 parts of tetrabutyl titanate, 12 parts ofabsolute ethyl alcohol, 1 part of water, and 1 part of diethanol amine. The method comprises the following steps: dropping absolute ethyl alcohol to tetrabutyl titanate; adding water with stirring; and adding diethanol amine with stirring; reacting to obtain the film plating liquid; and b, washing and drying the glass bead; then synchronously feeding the glass bead and the film plating liquid into a spraying film plating device; and covering a high-reflectivity plating film on the surface of the glass bead. The high-reflectivity glass bead has the advantages that the glass is free from high-reflectivity oxide; the high-reflectivity film plating liquid is plated on the surface of common portland or borosilicate glass bead under high temperature, so that the high-reflectivity plating film covers the surface; the secondary high-temperature melting process is not required, so that the production cost is decreased.