An experimental study on the back-corona discharge of high voltage pulse power supply was carried out. The positive solid Marx pulse generator was used as the discharge power supply, and the needle plate with honeycomb medium in the middle was used as the discharge electrode. The positive rectangular high voltage pulse output voltage was adjusted in 0～20 kV adjustable; the working frequency was adjusted in 0～1000 Hz; the pulse width was adjusted in 10～500 μs. The back-corona discharge experiment was carried out. The factors affecting the discharge current were analyzed according to the power supply and electrode parameters. Furthermore, under the same discharge electrode parameters, the high-voltage pulse back-corona and direct current（DC） back-corona were compared. The results show that the dielectric thickness, needle plate spacing, pulse width and discharge frequency all have certain effects on the back-corona discharge current. When the pulse discharge frequency is 100～1000 Hz and the back-corona occurs at the same voltage, the pulse back-corona discharge current is greater than the DC back-corona discharge current. This proves that the back-corona discharge effect excited by high voltage pulse is better.