The disclosure provides an automatic adjustment method and device for a color wheel. The method comprises: collecting a first frame image corresponding to an actual projection region; determining a proportion of normal pixels in the first frame image according to pixel information of the first frame image; determining a target correction value of the color wheel and each color switch according to the proportion of normal pixels in the first frame image; and adjusting the coordination parameter of the color wheel and each color switch to the target correction value, wherein the proportion of normal pixels in the image corresponding to the actual projection region obtained by adjusting the coordination parameter of the color wheel and each color switch to the target correction value is within an interval of [a %, 100%]; and the proportion of normal pixels in the first frame image is lower than a %, a % being lower than or equal to 100%.