The invention discloses a business module-based session access control method in an ERP (Enterprise Resource Planning) system. The implementation process of the method includes the following steps that: whether business modules need setting a common parameter is indentified, and the common parameter of the business modules is configured according to needs, wherein the common parameter is stored in a common parameter configuration table; a loading business module judges whether the business modules need switching the common parameter according to the common parameter configuration table of the business modules, if the business modules need switching the common parameter, the loading business module loads a common parameter switching control; and the storage and acquisition of the sessions of the business modules are completed. Compared with the prior art, the problem that different functions in the same business module separately obtain business common information, and a user inputs the business common information multiple times can be solved, and high cohesion and low coupling between modules can be realized. The business module-based session access control method has the advantages of high practicability, wide application range and high application value.