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In order to improve the online monitoring technique of hydrogen leakage in hydrogen energy and related areas, the high-performance room-temperature hydrogen sensors based on MoO3 nanowires were employed as sensor probes for building the online hydrogen leakage monitoring systems. The system was consisted of a master chip based on the Cortex-M3 core 32-bit low-power microcontrollers STM32F103VCT6, the WiFi terminals as the clients and the router network with an above machine as the server. Through the AT command and TCP / IP network transmission protocol technology, as well as the Labview software platform, the visual control and measurement results display interface were developed. The system was set up to a multi-functional system together with the data acquisition, leakage alarm and hydrogen concentration display. It can correct the detection result of the sensor probe by collecting the temperature and humidity signals in the environment, so as to realize the accurate monitoring of the hydrogen content in the environment under the atmospheric condition. With low cost, low power consumption, fast response, monitoring distance, simple network and so on, its wireless sensor mode can solve the problem of Wiring difficulty in hydrogen production and related areas. One can also change the number of sensor nodes and client user interface according to the actual needs. The system also possesses high extensibility.