White LEDs emit white light at room temperature after the rare-earth-doped fluorescent powder is excited by blue light chips or ultraviolet chips. The realization of the photoluminescence phenomenon develops a new type of all-solid-state lighting source that is lauded as the fourth-generation lighting source due to its energy-saving, environmental protection, and green lighting advantages. For modern-facility agriculture, blue light between 480 and 500 nm regulates plant rhythm, which is beneficial to plant growth. Blue light plays an important role in the light form and green plant photosynthesis. Green plants capture sunlight for photosynthesis by chlorophyll, carotenoids, lutein, and phytochrome, and LED lights suitable for plant growth can improve the efficiency of photosynthesis. However, it is difficult for traditional light sources to adjust the wavelength of light due to their light quality. In this case, ultraviolet light below 380 nm in the solar spectrum needs to be converted into blue light to improve crops’ light efficiency. Therefore, blue phosphor, with high light efficiency and high thermal stability, has become an important material in full-spectrum lighting and photobiological agriculture. Blue fluorescent materials play an important role in manufacturing white light-emitting diodes (W-LEDs) excited by near-ultraviolet (NUV) chips. This paper uses a high-temperature solid-phase method to prepare YVO4∶Tm3+ blue phosphor. X-ray diffractometer, scanning electron microscope, fluorescence spectrometer and other detection methods are used to characterize and analyze the samples’ phase structure, apparent morphology and luminescence properties. The results show that YVO4∶Tm3+ blue phosphor can be prepared by high-temperature solid-phase method calcination at 1 100 ℃ for 2 h. The powder is about 2 μm spherical, the excitation peak is in the 319 nm ultraviolet region, and the emission peak is in the 479 nm blue region. The color coordinates of the sample are located at (0.104 4, 0.122 4), a blue phosphor that is expected to be applied to white LEDs.