In order to more accurately evaluate the sharpness of the optical system and improve the qualification rate of camera products, this paper designs a camera sharpness detection system based on the Android platform. During the active alignment process of the camera assembly, the image sharpness of the camera is evaluated by measuring the Modulation Transfer Function. Unlike the existing inspection instruments on the market, this inspection system is small, strong universality, easy to operate, low cost and can record the Modulation Transfer Function of camera modules in different states in real time for the purpose of inspecting the image quality of camera modules. The system is more likely to be commercially and industrially viable in the field of camera module detection.