The utility model relates to the technique of measuring the conductance property of an insulating material especially under relatively high electric field intensity and temperature in high-voltage direct-current electrical equipment, specifically to a system for measuring the conductance property of an insulating material under high field intensity. According to the utility model, polytetrafluoroethylene is placed around upper and lower electrodes. By means of the structural design, the size of a high-field-intensity conductance measurement device is effectively reduced. Interference is resisted by means of a metal housing and shield wires, and a 6517 megger is adopted as a measurement element, so that the conductance property of the insulating material under high field intensity can be accurately measured. Application of the electric field and increase of temperature are allowed at the same time, so that the conductance property of the material can be measured under multiple factors. Reasonable selection of an electrode insulating material and the insulating structure design guarantee that the electrodes are suitable under high field intensity. By means of the system of the utility model, the conductance property of the insulating material under high field intensity can be studied, so as to provide a basis for experimental and theoretical study of the insulation reliability of power equipment.