The invention discloses a real-load detection method and system for a non-intrusive load electric energy meter. The method comprises the following steps: S11, connecting a plurality of high-precisionelectric energy meters arranged on real-load branches to a detected non-intrusive load electric energy meter; S12, connecting a standard electric energy meter with the detected non-intrusive load electric energy meter, with the standard electric energy meter being used for obtaining the true value of the total electricity consumption; and S13, comparing the accuracy of the metering data with the accuracy of the load type identification, generating a test result, and judging whether the error, the load type identification and the load switching identification of the detected non-intrusive loadelectric energy meter are qualified or not. The acquired data of the non-intrusive load electric energy meter and the high-precision intelligent electric energy meter are acquired, the acquired electric quantity data of each load branch are compared, and whether the load electric quantity identification of the non-intrusive load electric energy meter is qualified or not is judged.