The multi-functional electric power meter can monitor various electrical parameters such as voltage, current, frequency, power, power factor, energy, and demand, and features functions like switch state monitoring, limit alarm, analog output, energy pulse, and communication. As an intelligent and digital front-end collection element for the power grid, this meter is applicable in energy management systems, distribution automation, smart buildings, and intelligent switch cabinets; it offers various wiring methods for easy use and can meet various on-site requirements.