The utility model relates to a double-electrode-based detection device for transformer oil point discharge under an impulse voltage. The detection device is characterized by comprising an impulse voltage generator (1); an output end of the impulse voltage generator (1) is connected with the ground through a capacitive voltage divider (2) connected in series and is also connected with a point electrode (3) and a slightly non-uniform field electrode (4); the point electrode (3) and the slightly non-uniform field electrode (4) are respectively immersed in transformer oil in two containers, and bottoms of the two containers are respectively connected with the ground via ground wires; a current sensor (5) is sleeved on each ground wire; and an output end of each current sensor (5) is connected with an input end of an oscilloscope (8) via a series-connected high pass filter (7), and the other input end of the oscilloscope (8) is connected with the above capacitive voltage divider (2). The detection device of the utility model is capable of accurately measuring transformer oil point discharge under the impulse voltage.