For the low accuracy and bad consistency of blade edges in aero engines, a non-contact optical measuring system was established to measure the geometric dimensions and contour shapes of blade edges in a rapid and accurate way. In the system, a traditional coordinate measuring machine was taken as a platform, a special sensing device composed of two laser scanning sensors fixed at a certain angle to each other was taken as the front-end sensor and several data post-processing algorithms were integrated. In the measuring procedure, five transversals at the leading and trailing edges were selected and their contour information was measured to determine the geometric dimensions and machining allowance of the measured blade edges. The system could be used as a component of the manufacturing system to link the segments of designing, manufacturing and measuring of blades together. Finally, the leading and trailing edges of three sections of a blade after precision forging are measured by the system. The measuring results verify the effectiveness and practicability of the optical measuring system and show that the repeatability of the system meets the requirements for design and measuring of blade edges. In conclusion, the system could serve as an evaluating means for the machining quality of the leading and trailing edges of blades.