Abstract: For no guarantee of communication reliability of traditional coal mine wireless sensor network under accident condition because static route protocol cannot change route according to network states, an architecture of software defined cluster wireless sensor network of coal mine was designed by adding gateway nodes in cluster of coal mine wireless sensor network based on software defined network system and characteristic of the cluster topology. In the architecture, the gateway nodes in each domain collect data of sensor nodes for intra-domain or inter-domain communication, and controller manages flow, route and safety of the domain. Wireless sensor network based on the architecture can change route according to network states, which is suitable for coal mine safety monitoring.