The control and management of fungal diseases is a worldwide problem. A variety of microbial pigments have excellent antibacterial effects, and naturally occurring bacterial pigments may help in tackling fungal diseases. In order to explore the basic properties and biological functions of the pink pigment produced by Erwinia persicina Cp2, we used organic solvents to extract the pink pigment, analyzed the physicochemical properties of the pigment, determined the chemical composition using ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS), and selected five pathogenic fungi to study the inhibitory effects of the pink pigment. The results showed that the main component of the pink pigment was usambarensine, which had a good light stability and a good temperature stability at room temperature (