The adaptive angular disinterlacing device comprises: a complexity detection module to output a control signal for indicating a second range according to the complexity of the target pixel first/second display line light distribution curve in first range, a limiter to receive the control signal and generate the possible edge angular similarity corresponding to the first/second display line pixel in the second range, a comparator to compare the similarity and select the better edge angle, and a mixer to generate target pixel data according to the better angle, wherein it is better that the complexity of the first/second display line is less than the threshold in the second range.