The invention discloses an instant reimbursement closed-loop management method. An SAAS management system is organized based on a cloud platform unit, an APP can complete all operational processes, and both an APP end and a PC end can query, a cloud platform records, and data can be saved for more than 20 years. The occurrence and reimbursement of public business expenses of a unit organization are comprehensively controlled, the instant reimbursement closed-loop management method has the characteristics of whole-process monitoring, the supervision of entire personnel within the unit organization, the synchronization of handling personnel and expenses, and accurate and reasonable expenses, false, repeated and disputed reimbursement are eliminated, the method has real-time, real, accurate and highly efficient high execution values, the direct expense cost of the unit organization is recorded in real time in the whole process, the expense cost is obtained in the first time, the cost is effectively reduced, at the same time, the analysis, evaluation and statistical work of the unit organization are facilitated, and the unit organization can easily apply the method in daily financial management.