The invention discloses a non-invasive residential load monitoring circuit and system of a smart grid, and relates to the technical field of power equipment. The non-invasive residential load monitoring circuit of the smart grid comprises a live wire, a zero line, a first dry-reed relay, a first relay, a first capacitor, a diode, a second capacitor, a second dry-reed relay, a first triode, a firstresistor, a variable resistor, a second triode, an electric energy meter, a voltage source and a second relay, wherein the right side of the live wire is connected with the first dry-reed relay, thefirst capacitor and the second relay; the first dry-reed relay is connected with the zero line through the first relay; the right side of the first capacitor is connected with the diode; and the rightside of the diode is connected with the second capacitor and the second dry-reed relay. After the technical scheme is adopted, the non-invasive residential load monitoring circuit and system of the smart grid have the beneficial effects of simple structure, capability of meeting the needs of users, convenience for user, capability of well detecting the load of residents, humanization setting, good alarm effect, capability of real-time data transmission, accurate statistics on electric quantity and electric charge, and convenience for managers to use and operate.