In order to improve the effectiveness and security of financial voucher management, a financial voucher management system based on cloud computing platform is proposed. Firstly, the overall architecture of the system is designed according to the functional requirements of the system; Secondly, in the hardware part of the system, the system login module, certificate verification module and certificate audit module are designed, and the database of the system is designed. Finally, in the software part, based on the cloud computing platform, the association rule method is used to fully mine the characteristics of financial voucher data and identify the risk of financial voucher data. The experimental results show that compared with the traditional system, the designed system has good functions and low intrusion rate.