Automatic light ray adjusting device and method for camera

The invention relates to an automatic light ray adjusting device and method for a camera. The automatic light ray adjusting device comprises: a camera body, a motor, a controller and a lens are arranged in the camera body, the lens partially penetrates through the end face of one side of the camera body, a transmission shaft of the motor penetrates through the end face of one side of the camera body, and a transmission gear is fixedly sleeved at the end of the transmission shaft; the top of the camera body is provided with a light angle sensor for detecting a light angle, and the light angle sensor is in wired information transmission with the controller; and a polarizer capable of rotating is further arranged on the end face of one side of the camera body, the polarizer and the lens are coaxial, the polarizer is located on the outer side of the lens, and a gear ring meshed with the transmission gear is arranged on the polarizer. The light angle and intensity are detected through the sensor assembly, and the