Image brightness exposure compensation device and compensation method thereof

The invention discloses an image brightness exposure compensation device and a compensation method thereof. The image brightness exposure compensation device comprises a camera used for monitoring a shooting scene in real time, a liquid crystal screen used for exposure compensation and a driving board used for controlling the liquid crystal screen. Wherein the camera comprises a lens and a CCD (Charge Coupled Device) chip, the liquid crystal screen is arranged between the lens and the CCD chip in parallel at an interval to form a hamburger structure, and the liquid crystal screen is in communication connection with the driving board; the system further comprises an upper computer used for compensation calculation, the upper computer is in communication connection with the camera and the drive board through a USB interface, firstly, the liquid crystal screen is set to be full-light-transmitting, and the camera monitors a scene needing to be shot in real time and collects illumination information in the scene.