Thermal resistance measuring circuit and method, data processing equipment and remote IO device

The invention provides a thermal resistance measuring method, and the method comprises the steps: connecting one end of a resistor Rv with one end of a to-be-measured thermal resistor Rt in series; wherein the line resistance value of the first wire connected with the thermal resistor Rt and the resistor Rv to be tested is r; the other end of the resistor Rv is connected with a reference voltage power supply VR; the other end of the to-be-tested thermal resistor Rt is grounded through a second lead with a resistance value of r; wherein a first voltage measuring site Va is led out from the connecting end of the resistor Rv and the first wire, a second voltage measuring site Vb is led out from the connecting end of the thermal resistor Rt to be measured and the second wire, and then corresponding data processing equipment and a remote IO device are provided according to the measuring method. The invention provides the thermal resistor measurement method which is simple in wiring measurement and high in measurem