The invention discloses seven benzoyl amide derivative fluorescence probes, a preparation method and an application thereof. The benzoyl amide derivative fluorescence probes provided by the invention are prepared according to the following steps: taking benzoyl amide derivatives as a fluorophore and taking 3,6-dithio-1,8-diaminooctane as a main identifying part for metal ion, thereby compounding the benzoyl amide derivative fluorescence probes for detecting Fe3+ and Hg2+. The method is simple and the cost is low. The fluorescence probes 1b and 1c respectively have excellent selectivity to Fe3+ and Hg2+ and high determining sensitivity to Fe3+ and Hg2+, can qualitatively and quantitatively detect Fe3+ and Hg2+, can be used for identifying and detecting Fe (III) and Hg (II) in water and have excellent application prospect.