The invention discloses a wave-recording type station area residual current detection terminal and an early warning system. The terminal includes a residual current detection sampling module, a signal op-amp module, an MCU control module, a metering unit module, a LoRa communication module, and an indication display unit module , an alarm unit module and a storage module. The present invention has voltage, current and residual current measurement functions, and can monitor the residual current of the device under test in real time. By comparing with the set value, an alarm is generated, uploaded to the cloud server through the wireless network and sent push to the user. At the same time, the system has a fault wave recording function, which records the voltage and residual current waveforms of the set period before and after the fault, providing a basis for fault type judgment. The LoRa wireless communication adopted in the present invention reduces the system level, optimizes the transmission mode, and the abnormal data upload breakpoint rate in the station area drops by more than 72.6%.