A regional filtering quality guided phase unwrapping method based on InSAL relates to a phase unwrapping technology, and is provided to solve the problem that the existing phase unwrapping method is poor in unwrapping result. The method comprises the following steps: determining a pixel of the highest quality in an overall interferometric phase image, and carrying out phase unwrapping; detecting four pixels adjacent to the pixel of the highest quality, unwrapping the pixels, and storing wrapped pixels adjacent to each unwrapped pixel in an adjacent column; selecting a pixel of the highest quality from the adjacent column, carrying out phase unwrapping, storing wrapped pixels adjacent to the pixel in the adjacent column, and updating the adjacent column; repeating the steps until the phases of all the pixels are unwrapped and a primary unwrapping map is obtained; determining error points of the primary unwrapping graph, getting a pixel error flag matrix, and getting a pixel error flag matrix expander graph; and carrying out regional filtering on the primary unwrapping graph. The method of the invention is suitable for phase unwrapping.