The utility model discloses a surface charge measuring device. The moving direction of aversion mechanism is on a parallel with relative direction first, two electrodes among the the device. Extremely driving the insulator at the dynamic electricity like this and throwing off the back for another electrode, aversion mechanism can drive the electric charge probe and remove along relative direction first, two electrodes, and according to the insulator of different models, size, aversion mechanism can drive the electric charge probe and remove different distances promptly to assurance electric charge probe makes on adjusting the pertinent position of insulator well the utility model discloses the surface charge of the applicable insulator in different models, size of well surface charge measuring device measures, thereby has improved the utility model discloses well surface charge measuring device's commonality.