Positioning alarm system and positioning alarm method

The invention provides a positioning alarm system comprising a server used for obtaining positioning results of a plurality of objects having communication devices through a positioning algorithm. The server is provided with a processor, a storage unit where a plurality of algorithms that can be executed by the processor are stored, and an alarm grade determining module; the alarm grade determining module is used for determining the degree of closeness of the different objects according to the positioning results of the plurality of objects having the communication devices, and a corresponding alarm signal is generated according to the closeness of the different objects. At least one communication device relevant to the degree of the closeness of the different objects gives out an alarm to a user of the communication device through at least one user interface of the communication device according to the alarm signal.