The present invention relates to a fast-rise-time nanosecond high-voltage optical switch driving source comprising a Blumlein PFN pulsed network circuit which comprises two sets of single simulation lines, wherein a group of single simulation lines is provided with a high-voltage DC power supply, and each group of single simulation lines comprises multi-level LC units. In the single simulation lines of the high-voltage DC power supply, the last level of LC unit far away from the high-voltage DC power supply further comprises a spark gap switch (S2) and an auxiliary charging resistor (R2 ). The inductor of the LC unit of the level is connected in series with the spark gap switch (S2), and the auxiliary charging resistor (R2) is connected in parallel with the spark gap switch (R2). The output high-voltage square wave pulse rise time and lagging edge time of the driving source are short, and the performance and service lifetime of a plasma electro-optic switch are corresponding increased. The output voltage has a voltage-multiplying function, which can greatly reduce the size and cost of the driving source system and improve the reliability of the driving source.