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Aiming at the problems of long data processing time and low monitoring accuracy of the current atmospheric water vapor monitoring system, the atmospheric water vapor monitoring system based on Raman lidar is designed. Using a laser emitter, the nanorod is placed on the insulating silicon layer inside the emitter, which is connected with atomic level smooth silver to generate a resonant magnetic field to emit laser, so as to ensure the stability of the emission frequency. The photoelectric receiver is used to receive and return the laser wave, monitor the atmospheric water vapor and record the relevant data. The signal processor is used to obtain the light splitting device and send it to the photomultiplier tube for storage the system hardware design is completed. Through the Raman lidar technology, the atmospheric water vapor signal is collected, the scattered photon number and echo optical dry number in the atmosphere are detected. According to the monitoring data, the signal-to-noise ratio of atmospheric water vapor is calculated, and the proportion of water vapor in the atmosphere is deduced. The system software design is completed to realize the real-time monitoring of atmospheric water vapor. The experimental results show that the monitoring accuracy of atmospheric water vapor monitoring system based on Raman lidar is high, which can effectively shorten the data processing time.