A MARX circuit was designed by connecting the avalanche transistors serially and parallel. A high-voltage pulse driving source with low jitter was developed based on this circuit, and it was applied on a electro-optical switch clipping system of ultraviolet laser pulse. The time matching degree between high-voltage driving pulse and laser electro-optic system was regulated by synchronous regulator to get the best work state of the driving electrical pulses coupling with the electro-optical switch; work state of the electro-optical switch and shaping process of the laser were researched while matching the working time, when the amplitude and pulse width of high-voltage driving pulse was 2 690 V and 7.9 ns, the UV laser pulse with 7.1 ns in pulse width can be compressed to 2.1 ns. Then the transmittance of KDP crystal is 92.2%, and the efficiency of electro-optic switch has reached 31.7%.