The invention relates to an alarm for responding to disaster events, in particular to a wireless low-power-consumption sensor network system for geological disaster early warning and a using method thereof. The wireless low-power-consumption sensing network system for geological disaster early warning comprises a wireless monitoring point (1) and is characterized by further comprising an early warning point (2) and a monitoring cloud (3), wherein the wireless monitoring point (1) comprises a sensor (11), a detection circuit (12), a microprocessor (13), a wireless communication module (14) anda power source (15); the early warning point (2) comprises a remote terminal unit (21), an early warning indication device (22) and an uninterruptible power supply (23); and each wireless communication module (14) is wirelessly connected with the remote terminal unit (21) or the monitoring cloud (3) of the early warning point (2), and the remote terminal unit (21) is wirelessly connected with themonitoring cloud (3). The wireless low-power-consumption sensor network system is high in environmental adaptability, reduces the system cost, and is high in monitoring automation degree.