A method for raising luminous efficiency of field emissive luminescent material, a luminescent glass element and the preparing method thereof are provided. The method for raising luminous efficiency of field emissive luminescent material comprises: forming a nonperiodic metal film having metal micro-nano structure on the surface of a luminescent glass body having a composition of aM2O.bY2O3.cSiO2.dTb2O3; eradiating cathode ray to the metal film, and the cathode ray penetrating the metal film to make the glass body to luminesce. The luminescent glass element has a luminescent glass body, and a nonperiodic metal film having metal micro-nano structure forming on the glass body. The preparing method of the element comprises: preparing a luminescent glass body, forming a metal film on the surface of the luminescent glass body, annealing and cooling to obtain the luminescent glass element. The luminescent glass element in the invention has good transmissivity, high homogenization and luminous efficiency, good stability and simple structure. The preparing method thereof is simple and has a low cost.