The present invention provides a germanate luminescent material, a general molecular formula thereof being Zn2-2xGeO4:Mn2x,My, wherein M is selected from at least one of Ag, Au, Pt, Pd, and Cu metal nano particles; 0. The metal nano particle M is doped in a germanate luminescent substrate of the germanate luminescent material, and the metal nano particle M improves internal quantum efficiency of the luminescent material so that the germanate luminescent material has a high luminescent intensity. Also provided is a preparation method for the germanate luminescent material.