The invention relates to the display technology, and discloses a de-interlacing method, a de-interlacing device and a de-interlacing system, wherein the de-interlacing method comprises that an absolute error sum of macro blocks at an identical position of a current frame and a next frame is calculated; when the absolute error sum of the macro blocks at the identical position is smaller than a preset stationary absolute error sum, the de-interlacing of the macro blocks at the identical position is realized by using the copying mode. By using, the technical proposal provided by the embodiments of the invention can adopt different processing modes to different frames to carry out de-interlacing, and can combine different scenes to enhance the display quality of an image.