The utility model discloses a modular cooperative office system. Office system server cluster, the office system server cluster is arranged in the cabinet. The office system server cluster comprises aplurality of rack-mounted servers. The rack-mounted server comprises a system application server, a process management server, an official document management server, a file management server, a search engine server and the like. Compared with an overall deployment mode of a traditional system, according to the utility model, various services of the cooperative office system are respectively arranged in different servers; each server operates independently, so that the contention of each service for the same server resource can be reduced, the operation stability of each service can be improved, the high availability and stability of the system can be effectively ensured, and the clustering and modular operation of the cooperative office system is realized.