In this study, an integrated approach for the source identification of multi-elements in soil was proposed. Stable Pb isotopes, with the help of mineralogical approaches, have successfully been applied for the source identification of a multi-metal contaminated agricultural soil in a typical mining district in Southwest China. Quantitative analysis of source contributions revealed that the anthropogenic sources accounted for 61%-89% of soil metal accumulation. Stable isotope analysis indicated that mining waste leaching and mining dust raising from the road both contribute to soil contamination, but the signals of these two processes were overlapped, making it impossible to distinguish the contribution of each. Mineralogical analysis has therefore been used to aid in source identification. Considering that concentrations of other metals correlate well with Pb, it is suggested that the results from Pb isotope analysis could be further extrapolated to reveal the sources of other soil metals.