The invention discloses an intelligent electrical load identification method, device and system. The method comprises steps that a power and a power factor of a new load are acquired; whether the power and the power factor are in a preset power and power factor interval is determined; if yes, a voltage and current waveform of the new load are extracted; the voltage and the current waveform are analyzed to acquire a load category; whether the load category is a switch power source property load, a silicon controlled rectifier control property load or a resistive load is determined; if yes, whether the voltage and the current waveform of the new load are identical to a pre-stored load current and pre-stored current waveform is compared; if not, the new load is determined to be an illegal electrical appliance. The method is advantaged in that through load electricity characteristic curve learning, the electric appliance category can be intelligently identified, real-time monitoring is realized, and utilizing the illegal electric appliance can be prevented, moreover, troubles caused by error illegal electric appliance determination for public electricity management can be prevented.