In order to improve the management effect of power marketing audit work, this paper combines big data technology to carry out related data processing, changes the management mode of traditional power marketing audit work, analyzes the overall process and characteristics of the current power marketing audit case selection, and designs an audit system. Moreover, this paper builds a data warehouse based on data mining technology and realizes the process of automatic generation of the index system. In addition, this paper chooses the Tobit model proposed by Tobin, which is a restricted dependent variable model and can be better applied to the relevant analysis of power marketing audit indicators. Finally, this paper evaluates the effects of the method and system designed in this paper through simulation experiments. The experimental research results show that the power marketing audit management system based on big data technology can play an important role in power audits.