In this paper, the application of electronic nose (e-nose) technology in the detection of fresh vegetables freezing time is taken as the research goal. This paper uses the literature analysis method, test detection method and comparative analysis method, basing on a brief introduction of e-nose technology, it takes fresh beans stored for different days (1-6 days) at room temperature and -18°C freezing condition as the research object. According to the response of the sensor array to the volatile components and three model analysis methods, the freezing time of fresh vegetables is determined, among which, both PCA and LDA can accurately detect the freezing time of fresh vegetables. Loadings analysis shows that hydrogen sulfide and nitrogen oxides play a major role in detecting the freezing time of fresh vegetables. The results show that the e-nose can quickly and accurately detect the freezing time of fresh vegetables.