The invention discloses an image matting method, which comprises the following steps: acquiring an original image, and pre-dividing the original image into a plurality of subregions according to the space and color information of the original image; generating an image by using the subregions as nodes, and counting the weight values of the nodes of the image; dividing the original image into a foreground and a background by using a minimal cut method according to the weights; and integrating the foreground into a new image. The image matting method fully utilizes the space and color information of the original image to ensure the quality of the image matting, reduces nodes in an image and improves calculation efficiency.