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In this work, the perovskite fluorescent nanocrystals (CsPbBr 3) were successfully synthesized and wrapped with SiO 2 shell, utilized for the assembly of solid-state detection strip capable of conveniently and specifically detection of aflatoxin B 1 (AFB 1). The SiO 2 coating aimed to enhance the stability of CsPbBr 3 nanocrystals. The resulting CsPbBr 3 @SiO 2 material exhibited remarkable fluorescence properties, and further self-assembled onto solid-state plate, generating AFB 1 -specific quenched fluorescence at a specific wavelength of 515 nm. When combined with the capture of AFB 1 by magnetic nanoparticles conjugated with aptamers (MNPs-Apt), it was achieved the good separation and specific detection of AFB 1 toxin in food matrices. The constructed fluorescent solid-state detection strip based on CsPbBr 3 @SiO 2 exhibited good response to AFB 1 toxin within a linear range of 0.1–100 ng mL−1 and an impressive detection limit as low as 0.053 ng mL−1. This presents a new strategy for the rapid screening and convenient detection of highly toxic AFB 1. • Fluorescent CsPbBr 3 nanocrystals coated with SiO 2 to improve the stability. • Self-assembly CsPbBr 3 @SiO 2 -based fluorescent solid-state strip for detecting AFB 1. • Remarkable linear response and sensitivity to AFB 1 with portable solid-state strip. • Good recovery and precision for magnetic aptasensing detection of AFB 1 in foods. [ABSTRACT FROM AUTHOR]