The invention discloses an oil engine electricity generation monitoring terminal based on FFT spectral analysis. The monitoring terminal is used for monitoring the electricity generation state of an oil engine of a mobile communication base station. The monitoring terminal comprises an input interface, a state indicator lamp, an RS485 interface, an Ethernet interface, an oil engine electricity generation dry node interface, an antenna interface, a communication module antenna, a GPS/Beidou antenna and a processing mainboard inside an enclosure. The monitoring terminal receives alternating-current signals and direct-current signals through an alternating-current power source input interface and a direct-current power source input interface and converts the alternating-current signals and the direct-current signals into digital signals, and software inside a micro-processing unit conducts power supply state judgment, voltage measuring, battery charging and discharging state monitoring and communication processing. The monitoring terminal can cooperate with a background monitoring center so that the monitoring terminal can have a remote monitoring function; meanwhile, the monitoring terminal is provided with a dry node so that the purpose that the terminal can be directly connected to a DI interface of a moving ring monitoring system or a BTS (BBU) can be realized. Compared with a traditional monitoring terminal, the oil engine electricity generation monitoring terminal has the advantages of being high in power supply state judgment reliability, rich in additional function, friendly in man-machine interaction, easy to install, safe, stable and the like.