The present invention discloses a position service-based smart campus lost and found system. The system includes a network communications module, a data storage and query module, and a positioning module. The data storage and query module is used for storing a position fingerprint database and a campus map, and performing data processing on lost item information that is released by a user, processing chatting information of users, binding multiple pieces of information of the same user, and processing feedback information of an owner after the lost item is returned. The network communications module and the positioning module are connected to a network. The positioning module is used for loading a campus map and the position fingerprint database that are stored in the data storage and query module, and providing three-dimensional positioning navigation information of the lost item by using a position fingerprint positioning algorithm. The system has the advantage that it is simpler and more convenient to report loss of the item and find the owner.