The present invention provides a crystalline t-butyl 2-[(4R,6S)-6-formyl-2,2-dimethyl-1,3-dioxane-4-yl]acetate and a preparation method therefor.La présente invention concerne un 2-[(4R,6S)-6-formyl-2,2-diméthyl-1,3-dioxane-4-yl]acétate de t-butyle cristallin et son procédé de préparation.본 발명은 결정형 t-부틸 2-[(4R,6S)-6-포밀-2,2-디메틸-1,3-디옥산-4-일]아세테이트를 제공하며, 이의 제조방법을 제공한다.