The invention relates to a metal nanoparticle supported Eu<3+> doped tungstate white fluorescent powder. The matrix material is doped with LiIn(WO4)2 and Eu<3+> rare earth ions, the chemical formula is LiInx(WO4)2:(1-x)Eu<3+>/yM (M is Ag and Pt), x is 0.8 to 0.99, and y is Ag and Pt supported molar weight or weight percentage. The metal nanoparticle supported Eu<3+> doped tungstate white fluorescent powder is prepared by combining a solid-phase sintering method and a liquid-phase reducing method. The solid-phase sintering method comprises the steps of weighing various materials according to the proportion in the chemical general formula, grinding and mixing uniformly, calcining at a temperature of 700 DEG C for 8 hours for the first time, cooling to a room temperature and grinding, calcining at the temperature of 900 DEG C for 12 hours again, cooling and grinding to obtain the fluorescent powder. In the liquid-phase reducing method and a light supporting method, the metal nanoparticles are supported to the surface of the fluorescent powder to form metal nanometer attachment on the surface. Compared with the common fluorescent powder without being supported by the metal nanoparticles, the fluorescent powder has higher luminous efficiency.