The invention discloses a private cloud based micro-seismic wireless monitoring system which comprises an acquisition system, a wireless communication system and a private cloud platform, wherein the wireless communication system comprises a wireless AP (access point) base station and a wireless AP slave station. The private cloud platform comprises a main server and a standby server. The wireless communication system transmits information acquired by the acquisition system to the private cloud platform. By the private cloud based micro-seismic wireless monitoring system and a data processing method thereof, data monitoring interruption due to data transmission cable damage can be effectively avoided, and loss of stored data and stop of information acquisition can be avoided when the main server fails.