The invention provides a method for preparing strontium aluminate long-persistence luminescent materials based on nanometer fusing assistants. The invention has the technical scheme that the method comprises the following steps: simultaneously preparing a nanometer ammonium pentaborate powder fusing assistant A and a nanometer aluminium borate powder fusing assistant B by a liquid phase method; then, obtaining boron of a mixed fusing assistant and a defect forming assistant through the introduction of the fusing assistant A and the fusing assistant B; and finally, using solid-phase reaction for preparing the long-persistence luminescent materials at the low reaction temperature. The invention overcomes the defects of overhigh temperature required by the reaction, high cost of equipment used in the reaction, high consumption of energy required in the synthesis process, poor luminescent performance of products and the like when the existing solid-phase method is used for preparing the strontium aluminate long-persistence luminescent materials. At the same time, the invention also solves the problems that the traditional products only pursue the persistence time, so the fusing assistant with high boron content is added, the strontium aluminate reaction products can easily obtain the excessive sintering, and the application effect of the pulverized strontium aluminate reaction products is poor. The luminescent materials of the invention are mainly applied to the fields of safety passage display, luminescent printing ink, luminous lighting and light detection, and are also usedfor novel energy-saving LED lamps with persistence.