1. An angle de-skew device used in an image processing system to rotate a skewed image according to a reference point as rotated center, comprising: a first accumulator circuit to accumulate X coordinate value of a first pixel of the skewed image by a first offset and to output one and upward first accumulation results into the image processing system; a second accumulator circuit to accumulate Y coordinate value of a first pixel of the skewed image by a second offset and to output one and upward second accumulation results into the image processing system; and a counter connected with the first and second accumulator circuit to control the number of accumulation times of the first and second accumulator circuits.