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K₂SiF₆:Mn⁴⁺ phosphor was prepared by wet chemical etching, and the effect of the raw material molar ratio of K/Mn of different materials and different reaction time on the structure and properties of phosphor was studied,the surface of K₂SiF₆:Mn⁴⁺ was coated with SiO₂ to improve the thermal stability of K₂SiF₆:Mn⁴⁺ phosphor by sol-gel method. The structure, morphology, excitation spectrum and emission spectrum of phosphor powder were characterized by X-ray diffraction, scanning electron microscope and fluorescence spectrometer. The results show that the change of K/Mn ratio does not change the crystal structure of K₂SiF₆:Mn⁴⁺, the sample has cubic structure. At 460nm excitation, the strongest narrowband emission peak is located at 630nm (²E_g → ⁴A₂). The crystal structure of K₂SiF₆:Mn⁴⁺ phosphor coated with SiO₂ has not been changed. The results show that the thermal stability of the K₂SiF₆:Mn⁴⁺ phosphor coated with SiO₂ is improved.