Regional automatic meteorology station plays an active role in the meteorological service of flood season, but as a result of the continuous operation of regional station and the aging of solar panel and battery, which lead to the frequent missing of data. Based on the above reasons, it is necessary to design the online monitoring system of battery in the regional automatic meteorology station. The hardware of the system is made up of PIC 16F microcontroller which carries out the acquisition of voltage and sending of the packaged raw data. The software of the system is developed by Delphi. Multiple independent reception service programs which can ensure the receiving and processing of mass data at the same time are generated by the dynamically generated server technology when receiving data. Multithreading and database connection pool technology which can ensure the integrity of data are toke when extracting and processing data. The voltage state of solar panels, battery and load is monitored by the system all the time. The remote transmission of data can be realized by the use of GPRS. In addition, realtime alerts can be sent out when the voltage of output load is too low.