The invention provides a video image processing method, which is mainly based on liquid crystal television dynamic backlight control, and the method comprises the following steps: a system sets a first threshold value; numbers of video signals of all gray levels are counted in the sequence from high gray level to low gray level, and are accumulated to get a first accumulating number; the first accumulating number is compared with the set first threshold value, and the lowest gray level with the accumulating number not more than the set threshold value correspondingly is selected to serve as adividing gray level of video image processing; image signals at both sides of the dividing gray level are respectively processed for keeping the image brightness below the dividing gray level unchanged, the image brightness above the dividing gray level becomes weaker, and the backlight brightness is reduced the most. The invention keeps the image pixels to be weakened in a certain range, and limits the number of weakened pixels to avoid the whole image from being affected obviously, meanwhile saving power consumption and increasing the contrast ratio.