The invention discloses a sensing voltage measuring device. The sensing voltage measuring device comprises a first measuring module, a second measuring module and a conduction module, wherein the first measuring module is used for judging whether sensing voltage in a circuit exceeds a preset voltage threshold value or not, and measuring the sensing voltage which exceeds the preset voltage threshold value; the second measuring module is used for measuring the sensing voltage which does not exceed the preset voltage threshold value; and the conduction module is used for conducting the circuit tothe second measuring module when the first measuring module determines that the sensing voltage does not exceed the preset voltage threshold value. By judgment on whether the sensing voltage in the circuit exceeds the preset voltage threshold value or not, the sensing voltage which exceeds the preset voltage threshold value and the sensing voltage which does not exceed the preset voltage threshold value are measured separately, by arrangement of the conduction module, high sensing voltage and low sensing voltage are converted to the corresponding measuring circuits and then are measured, andthus, the problems that in the prior art, a resistance voltage division circuit is lack of protection through a high voltage circuit, and high-circuit sensing voltage cannot be measured are solved.