The present invention relates to a thin film of a polymer electrolyte improved in electrical and mechanical properties and a method of manufacturing the same. More particularly, the present invention relates to a polymer electrolyte thin film in which ionic conductivity and mechanical properties of a polymer electrolyte thin film are improved through terminal chemistry, And a method for manufacturing the same. According to the present invention, there is provided a solid electrolyte comprising a block copolymer having high ion conductivity at room temperature and excellent mechanical strength, and a method for producing the solid electrolyte. The solid electrolyte according to the present invention can be used as an improved polymer electrolyte membrane which is easy to manufacture and exhibits high ion conductivity at room temperature and can be utilized as a next generation material of battery technology.
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