The invention relates to a standard resistor, comprising a datum resistor and an extraction loop; wherein the datum loop comprises a heat dissipation shell and a resistor manganin plate, a heating plate and a controllable heating source arranged inside the shell; wherein the resistor manganin plate, the heating plate and the controllable heating source are sequentially arranged from bottom to topin an overlaying way; a temperature sensor is respectively arranged between the heating plate and the resistor manganin plate and between the lower surface of the resistor manganin plate and the heatdissipation shell; the extraction loop comprises potential terminal leads and current terminal leads; the datum resistor is in series connection between the current terminal leads, a lead is respectively led out from the two terminals of the datum resistor to serve as the potential terminal lead; the potential terminal and the current terminal are respectively located in two different directions of the datum resistor; the two leads of the potential terminal and the two leads of the current terminal are in the state of mutual inductance; the current terminal leads and the potential terminal leads are led out from different directions of the shell.