Concepts and development history of domestic and foreign mine Internet of Things(IoT) were introduced, then research states of mine IoT were summarized from aspects of system architecture, perception layer, transport layer, application layer and engineering application. Main problems existing in current research of mine IoT were pointed out, namely lacking intelligent sensor or device with low energy consumption, environmental energy capturing technology of mine, data and network security method, public service platform and standards about mine IoT. Some possible development directions of mine IoT were probed on from aspects of embedded intelligent information sensing technology, cloud service platform of mine safety production based on big data and security.