The utility model provides a simulation medium partial discharge's electrode model, it includes the thin - film media that insulation box body, high voltage conducting rod, high voltage electrode, dull and stereotyped ground electrode and thickness can be adjusted, insulation box body has sealed cavity, splendid attire liquid medium or gaseous medium in the sealed cavity, the vertical setting of high voltage conducting rod, high voltage conducting rod wear to establish and sealing connection on insulation box body's roof, high voltage conducting rod can reciprocate along its axial, its lower extreme stretches into and seals in the cavity, high voltage electrode can dismantle ground and connect the lower extreme at high voltage conducting rod, dull and stereotyped ground electrode is fixed in in the insulation box body, dull and stereotyped ground electrode perpendicular to high voltage conducting rod's axis, dull and stereotyped ground electrode are located high voltage electrode's below, and interval setting relative with high voltage electrode, thin - film media places in dull and stereotyped ground electrode's upper surface, and high voltage electrode's lower extreme contacts with thin - film media's upper surface. The utility model discloses can provide multiple experiment condition, the different discharge characteristics of research.