The invention relates to a single-phase prepaid electric energy meter based on a LoRa communication technology and belongs to the field of smart electric meters. An electric energy meter comprises a microprocessor, an electric energy metering module, a relay control module, a power supply module, a universal module, a prepaid module and a LoRa communication module, wherein the LoRa communication module comprises a main control module, a radio frequency module, a communication interface and a power management module. Through the optimized design of an impedance matching network and a microstriptransmission line of an RF module, the path loss of a radio frequency link is reduced, and the energy transmission efficiency is improved. The electric energy meter can reach an effective communication distance of 6000 meters and has a long communication distance, the effective communication passing through 7 walls and 5 floors can be achieved, and the communication penetration capability is strong. The single-phase prepaid electric energy meter can satisfy the communication requirements of smart meter reading and has broad application prospects.