The invention relates to an optical coating device. The optical coating device comprises a vacuum coating chamber, a component-to-be-coated bearing rack and a coating source, wherein the component-to-be-coated bearing rack and the coating source are arranged in the vacuum coating chamber. The optical coating device also comprises a coating baffle, wherein the coating baffle is arranged between the component-to-be-coated bearing rack and the coating source and is near the component-to-be-coated bearing rack. The coating baffle comprises a first baffle and a second baffle; the first baffle can divide the vacuum coating chamber into two rooms and is provided with a through hole; the through hole is arranged opposite to the component-to-be-coated bearing rack and the coating source, so that the coating material gas generated by the coating source reaches the component to be coated on the component-to-be-coated bearing rack through the through hole; and the second baffle can move opposite to the first baffle, and respectively shield or expose the through hole. The optical coating device can accurately control coating thickness and enhance coating quality.