Monitoring apparatus, sewage treatment system and monitoring method using the same

The invention relates to a monitoring device, a sewage treatment system using the device and a monitoring method thereof. The device comprises a central processing unit CPU and a digital signal input interface, an analog-digital conversion module, a radio frequency unit and a memory which are communicated and connected with the central processing unit CPU, and also comprises a power supply and an antenna which is connected with the radio frequency unit, wherein the power supply supplies power for various modules of the monitoring device; and the radio frequency unit is connected with a GPRS communication network or a CDMA communication network through the antenna. The system comprises a distributed sewage treatment device, the monitoring device which is connected with the distributed sewage treatment device, and a manager mobile phone. The method uses the monitoring device to realize remote control of the distributed sewage treatment device, acquire failure information and transmit the failure information to