The invention discloses a lightweight fair conference location decision service system and method with a privacy protection function. The system comprises a User and a VLCS (Virtual Location Cloud Serve); the User means a user of handheld intelligent mobile equipment; the VLCS is a location cloud service in a user view, and consists of a LCCS (Location Compute Cloud Server) and a LDCS (Location Decision Cloud Server); the LCCS is a cloud server for providing an auxiliary computing function in the process of deciding a fair conference location, and directly interacts with the User; the LDCS decides an optimal meeting location according to an intermediate result provided by the LCCS, carries out intra-cloud interaction with the LCCS, and does not directly interact with the User; and the optimal meeting location means that a sum of Euclid distances from other locations to the meeting location is minimum. According to the lightweight fair conference location decision service system and method disclosed by the invention, not only can the optimal conference location be determined for the user in a case of not leaking a user location, but also a computing amount can be effectively reduced and service response time can be effectively shortened.