The invention discloses an accurate underground wireless positioning system and method based on the combination of the WiFi and a gyroscope. The underground wireless accurate positioning system comprises a ground part and an underground part. The ground part is mainly composed of a server and a corresponding database. The underground part mainly comprises a mobile terminal, an electronic tag and a wireless AP. The mobile terminal is composed of a positioning module, a processing module, a WiFi module and a power source part. The positioning module is mainly composed of a WiFi module and a gyroscope data collecting and processing module. The gyroscope is introduced to the underground wireless accurate positioning system, the positioning technology of the gyroscope and WiFi combination is adopted, and very high positioning accuracy can be achieved; in addition, the integrated wireless AP can be directly connected through an optical cable or a network cable, a set of wired routers are formed, data, voice, video images and other information sent by the mobile terminal are transmitted to a ground dispatching center through the wired routers formed among substations, and various underground comprehensive service information can be transmitted.