An integrated system for laser frequency locking of atomic interferometers was developed in order to improve the miniaturization and stability of atomic interferometers. The integrated circuit system is used for frequency stabilized spectral signal acquisition, modulation and demodulation, and ZYNQ is used to complete the digital Proportional Integration Differentiation (PID) function to realize the low⁃noise and fast locking of the laser frequency. The integrated modem module has a circuit area of only 77 mm × 113 mm, which is capable of meeting the laser locking requirements for use in most alkaline atomic energy stages. Experiments were conducted to verify the performance of the integrated system for laser frequency locking in atomic interferometers, and the results show that: the frequency fluctuation after laser frequency locking is 98.81 kHz@7 h; the re⁃locking time of the laser frequency is 600 μs@100 MHz; and there is no de⁃locking in a long⁃term measurement of 100 h. This system provides a strong support for promoting the application of atomic interferometer in complex environments such as geological research and resource exploration.