The invention discloses a bidding informatization management system with a confidentiality function. The system comprises a basic information management module, a bidding procurement module, a file encryption module, a bidding procurement module, a negotiation procurement module and a direct procurement module. All the modules are connected with a first client and a second client through a network, client information of the first client and client information of the second client are checked, and the information is judged and then enters the corresponding modules. By means of the system, the system is provided with the procurement modules in various modes, switching in multiple systems is not needed, and use is more convenient. The system automatically judges which procurement module is used by the clients, and compared with manual judgment, the error rate is reduced. Meanwhile, confidentiality measures are added for unpublished biding documents, and justice and equity of bidding are ensured.