Laser driving circuit is an important part of lidar, and its technical specifications will directly affect the overall performance of lidar. According to the characteristics of laser, the laser pulse has two main parameters: pulse width and energy. These two factors have a large effect on the distance resolution and the range respectively. Most of the common driving circuits use DC-DC boost circuit, large inductor charge and discharge to achieve, the energy is unstable, and the circuit ripple is large. In the past decade, cost-effective Si MOSFET devices have been highly commercialized. However, the parasitic inductance and switching quality factor will significantly affect the laser driving circuit. When the pulse width is narrow to a certain extent, the peak power of laser pulse will drop sharply. In order to solve the above problems, this paper designs a laser drive circuit, which realizes a drive circuit with narrow pulse width, small size, low power consumption, low noise, and strong high voltage stability, and points out what should be paid attention to when designing the drive circuit. The output of the laser can be directly controlled by the CPU, to achieve high repetition frequency, The output rising edge is about 2ns and a pulse width of 10ns, The size of the circuit board is about 3.2 cm×2.8 cm, and the power consumption of the single board is about 0.5 w, these characteristics can be used in the engineering of lidar.