Abstract: In view of problem of undistributed energy consumption of nodes of WSN caused by narrow and long mine roadway, the paper proposed a new routing mechanism of mine WSN, namely LBUC-M protocol: constructing a new threshold formula to elect candidate cluster-head in certain cycle and determining final cluster-head by non-uniform radius to realize less clusters far away from sink node and more nodes in these clusters, and vise versa, more clusters near sink node and less nodes in these clusters, so as to reduce burden of data transmission of cluster-head nodes near sink node and get goal of load balancing. The simulation result showed that LBUC-M protocol effectively reduces energy consumption of nodes and prolongs life cycle of WSN.