The invention relates to the technical field of aero-engine blade detection, and particularly discloses an aero-engine blade intake and exhaust edge shape detection method, which comprises the steps of obtaining blade profile contour theoretical
point cloud data, blade profile contour actual
measurement point cloud data and a deviation value of a blade; performing
curve fitting according to the theoretical
point cloud data of the blade profile to obtain a theoretical blade profile curve and a theoretical blade profile mean camber line, and performing
curve fitting according to the actually measured
point cloud data of the blade profile to obtain an actually measured blade profile curve and an actually measured blade profile mean camber line; performing calculating according to the theoretical blade profile curve and the theoretical mean camber line to obtain a
front edge theoretical vertex and a rear edge theoretical vertex; performing calculating according to the actually measured blade profile curve and the actually measured mean camber line to obtain a
front edge actually measured vertex and a rear edge actually measured vertex; calculating a
front edge actual measurement vertex curvature
radius and a rear edge actual measurement vertex curvature
radius; and comparing and judging the front edge shape and the rear edge shape of the blade. According to the aero-engine blade intake and exhaust edge shape detection method provided by the invention, the defect detection efficiency of the blade is improved.