Abstract: In order to count and project water consumption of each unit of a coal mine so as to decrease water waste, a water consumption monitoring system was designed by use of PLC and wireless Ethernet, and the whole structure, designs of hardware and software, field debugging and application of the system were introduced in details. In the system, PLC is taken as the core of field monitoring layer to get information of water consumption, and the information is transmitted through wireless Ethernet to central monitoring and management layer for real-time displaying. The debugging and running results showed that the system measures water consumption correctly and runs stably, which realizes remote water consumption monitoring.