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In this study, CsPbBr₃@SiO₂ perovskite nanocrystal composites (CsPbBr₃@SiO₂ PNCCs) were synthesized by a benzyl bromide nucleophilic substitution strategy. Homogeneous halide exchange between CsPbBr₃@SiO₂ PNCCs and Cl⁻ solution (aqueous phase) was applied to the determination of Cl⁻ in sea sand samples. Fast halide exchange with Cl⁻ in the aqueous phase without any magnetic stirring or pH regulation resulted in the blue shift of the photoluminescence (PL) wavelength and vivid PL color changes from green to blue. The results show that the PL sensing of Cl⁻ in aqueous samples could be implemented by using the halide exchange of CsPbBr₃@SiO₂ PNCCs. A linear relationship between the PL wavelength shift and the Cl⁻ concentration in the range of 0 to 3.0% was found, which was applied to the determination of Cl⁻ concentration in sea sand samples. This method greatly simplifies the detection process and provides a new idea for further broadening PL sensing using the CsPbBr₃ PNC halide.