The utility model relates to an actual voltage impulse shape effect transformer oil down punctures characteristic testing system. Its characteristics are: including experimental cavity (5), this experiment cavity (5) ground connection is and install sleeve pipe (3) at its top, the top and an impulse generator's (1) the output of this sleeve pipe (3) are connected, the output of this impulse generator (1) is still through divider (2) ground connection, the bottom of aforementioned sleeve pipe (3) loops through the winding, matched resistance (7) are connected with the bottom of experimental cavity (5), wherein the winding comprises at least two winding section (4) of establishing ties together, wherein still be equipped with in experimental cavity (5) experimental ball crack (6). Adopt the utility model discloses a testing system, can be accurate actual voltage impulse shape effect transformer oil's puncture characteristic down among the grasp transformer winding, to the insulating design of transformer, failure analysis and master the insulating basic insulation characteristic of transformer and have and refer to and the directive significance.