The present invention relates to a method for producing a core-shell structure including a CdSe core based on a glyme solvent. The method of the present invention enables the production of a core-shell structure including a CdSe core in a simple and economical manner. The present invention also relates to a core-shell structure including a CdSe core produced by the method. The core-shell structure of the present invention includes a large amount of CdSe and is uniform in size. Particularly, the core-shell structure of the present invention can be coated on a flexible plastic substrate of an optical device or semiconductor device due to its high stability.