The utility model discloses a box is preserved to light -resistant medicine, includes a box body and box cover, be connected through the buckle lock between box body and the lid, wherein, the corner sets of lid has the pressfitting post, be provided with the layer board in the box body, the corner sets of the lower part of layer board has the spring holder, be provided with the spring on the spring holder, the corner sets of box body bottom has spacing post, the one end of spring is cup jointed on spacing post, the other end of spring is embedded into in the spring holder, the lid lock is to the box body and then make the pressfitting capital press the layer board down, spacing post can be inserted to close and link together with the spring holder, lid, box body are the opaque plastic products. The length of spring is less than the degree of depth of box body, and pressfitting post and lid be integrated into one piece during fabrication, and spring holder and layer board be integrated into one piece during fabrication, and box body and spacing post be integrated into one piece during fabrication. The utility model discloses simple structure, convenient to use gets it filled easily and effective light -resistant.