Considering that many issues such as the limited energy in mine safety monitoring system, the accidents take place frequently. We select a new kind of wireless monitoring system and protocol, and improve it constantly. We propose a reliable and energy efficient routing protocol——SPIN-RE(SPIN-Reliable and Energy efficient) based on SPIN, so as to improve the single node energy efficiency and extend the network lifetime. It does not only increase the energy threshold but also the memory in the REQ message list to balance the energy consumption on data transmission across the single node and the network to extend the network lifetime. Simulating and comparing to the SPIN-RE and SPIN routing protocol, the results present that the SPIN-RE routing protocol improves greatly on the saving energy.