An optical waveguide platform and a manufacturing method thereof are provided. In the provided optical waveguide platform, a terrace on which an optical device is mounted is formed by using an etch stopper pattern formed on a lower clad layer. Therefore, the optical device is mounted without processing a silicon substrate. In addition, in the provided optical waveguide platform, the etch stopper pattern is formed on the lower clad layer to prevent defocus in a photolithography process due to an etch step, so as not to damage a fine waveguide pattern. Moreover, an optical waveguide is formed on the terrace in manufacturing the optical waveguide platform to examine the characteristics of the optical waveguide device before etching a trench.