Identification of water source types is a decisive factor of water inrush rescue, of great significance for safe mining. Based on the long working time of conventional discriminant method, on-line analysis system of rapid analyzing water source type by multiple linear discriminations was put forward, which adopted fluorescence spectra, pH value and electrical conductivity and other physical sensors. Lijiazui Mine of Huainan Group was taken as example, based on 13 sets of water sample data on the site, showing good discriminant effect, the practice showed that the system is an effective monitoring means of online water identification.