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In order to improve the measuring accuracy and resolution of time grating displacement sensor, we have put forward a time grating displacement sensor signal processing system based on STM32F4. This system includes hardware circuit and software design. The hardware circuit used STM32F4 kernel processor chip and complex programmable logic device CPLD as the core, including the integrated signal conditioning, signal processing circuit module, etc. Through the software design controled time gate signal acquisition and processing. Inserted phase difference between induction signal and reference signal by using the high-frequency pulse of STM32F4 kernel to complete the phase detection. By using this system, the experiments indicated that the peak-to-peak value of time grating position error is only 2.4＂. Realized the high precision and high resolution angular displacement measurement of time grating sensor.