The invention relates to a fluorescent probe for recognizing phenylthioalcohol (PhSH), and belongs to the field of the fluorescent probe. The fluorescent probe has a molecular structure shown in the description. The maximum emission wavelength of the fluorescent probe is 610nm; after the probe molecule and PhSH act, red fluorescence light is given out; in addition, the detection limit is lower; the sensitivity is high; the emission wavelength can reduce light damage on living cells and background fluorescence in the probe detection process in the red light region; the penetrating capability oforganisms on tissues is enhanced. The fluorescent probe molecule has good linearity in certain time and concentration range; the recognition capability on the PhSH is high; the selectivity is high; the anti-interference capability is high; the PhSH visual detection can be realized in pure water solution and living cells; the fluorescent probe has important application values in the fields of biological chemistry and the like.