A grating structure and a UV light, where the grating structure includes at least two up-down baffles provided at intervals, the upper surface and the lower surface of each baffle is provided with a light absorption layer, two adjacent baffles enclose to form a light outlet; in the light emission direction of the light outlet, each baffle includes the incoming light section, the light filter section and the outgoing light section, and the incoming light section, the light filter section and the outgoing light section are respectively the first plate body, second plate body and third plate body connected in sequence, the upper surface and the lower surface of the light filter section are provided respectively with multiple upper convexes and multiple lower convexes, the height difference of the top of the upper convexes and the bottom of the lower convexes is greater than 1.5 mm.