Abstract: A financial data secure sharing method, a device and a system based on a cloud server include steps of: logging-in with a terminal through a data access sharing interface provided by the cloud server to obtain a financial data sharing authority for a financial data sharing party; filling-in and uploading financial data according to a data sharing upload format provided by the cloud server; performing a unified format conversion on the financial data, so as to generate unified-format financial data; selecting an encryption method for the unified-format financial data; processing the unified-format financial data with encryption authentication, and obtaining an encryption authentication result; and storing the encryption authentication result in a memory of the cloud server based on a preset storage structure, and providing data sharing to a corresponding user through the data access sharing interface. The financial data can be shared according to the user identity authority.