A mold for high stretching of an in-mold decorative film, comprising an upper base, a stationary mold, a film pressing frame, a movable mold and a lower base sequentially arranged from top to bottom. The film pressing frame can move up and down; a film to be stretched is placed between the film pressing frame and the stationary mold; a cavity block is fixed in the stationary mold, the lower surface of the cavity block is provided with air holes, and the upper surface is provided with a vacuum air pumping cavity communicated with the air holes; a core block is fixed in the movable mold, and a core ejection movable block is arranged in the core block; the core ejection movable block and the movable mold are provided with a heated air inlet channel and an air outlet channel which are communicated with the outside.