The present disclosure relates to a white balance adjustment method and system. The method includes: obtaining initial white balance components of each of grayscales respectively for red pixels, green pixels, and blue pixels; obtaining a first relationship curve by fitting the white balance component of the red pixel with the green pixel, and obtaining a second relationship curve by fitting the white balance component of the blue pixel with the green pixel; calculating the adjusted white balance component of the green pixel after the GAMMA voltage is adjusted; substituting the adjusted white balance component of the green pixel into the first relationship curve and the second relationship curve to respectively obtain the adjusted white balance components of the red pixel and the blue pixel; and creating a second white balance look-up table according to the adjusted white balance components of the red pixels, the green pixels, and blue pixels.