Aiming at the practical needs of multi-user collaborative editing in power grid GIS, a multi-user cooperative editing of power grid GIS based on locking mechanism is proposed based on the task division and version management technology to ensure the consistency and correctness of the edited data. This study first analyzes the architecture and editing process of collaborative editing. Then it focuses on the implementation of the locking mechanism in the collaborative editing, the locking process and the data synchronization between the clients. Finally, a prototype system is constructed based on the test data of a certain province, and it verifies the multi-user collaborative editing of power grid GIS based on locking mechanism.