The invention discloses a gallate luminous material and a prepration method thereof, the chemical formula of the gallate luminous material is La1-xGaO3: Lnx, My, wherein Ln is one or two of Tm 3+, Tb 3+, Eu 3+ and Sm 3+, M is one of Ag, Au, Pt and Pd, y is the molar ratio of La1-xGaO3: Lnx, the value range of x is 0.001-0.1, and the value range of y is 0.00002-0.01. The sol-gel method is adopted for preparing the gallate luminous material, the process is simple, the process conditions are easy to achieve, the quality of a prepared product is high, and the obtained gallate luminous material can greatly improve the luminous efficiency and have excellent luminous performance.