The embodiment of the invention relates to the field of image processing, and particularly relates to a stripe laser echo information extraction method comprising the steps that an original echo stripe diagram is read, the grayscale value of each pixel point on the echo stripe diagram is seen as the result of random walk of the grayscale value and the image features are analyzed; a certain pixel point is randomly selected and the difference value of the grayscale value is calculated, an interval value R is set and ||(x2,y2)-(x1,y1)||=R<=1; the expectation value of the difference value is calculated; the expectation value E(G) and the interval value R meet the relation: log(E)=(3-D)log R+log C according to the fractal theory; the array of a group of corresponding expectation values E and the interval values R is obtained through multiple times of iteration of the interval value R so as to acquire the feature value D; the feature value D in the image is displayed in the form or the grayscale image so as to obtain a feature value stripe diagram; the enhanced signal area is found; and information extraction is performed on the original echo stripe diagram according to the enhanced signal area so as to acquire the pure echo information diagram. The echo image is enabled to be clearer.