Fuente: WIPO "hemp" The utility model provides a China-hemp cultivation box with an adjustable air vent, which comprises a bottom box and a cover body, the cover body covers the bottom box, the upper side surface of the cover body is provided with a round air vent, the China-hemp cultivation box further comprises a semicircular fixing plate and a semicircular adjusting plate, the diameter of the semicircular fixing plate and the semicircular adjusting plate is equal to that of the air vent, the edge of the lower end of the air vent is provided with a convex supporting edge, and the convex supporting edge is provided with an adjustable air vent. The fixing plate is arranged in the air hole, the supporting edge is used for supporting the fixing plate, the edge of the fixing plate is provided with two positioning columns protruding downwards, the cover body at the edge of the air hole is provided with positioning holes corresponding to the positioning columns, a center shaft hole is formed in the circle center position of the fixing plate, and a rotating shaft is connected into the center shaft hole. The rotating shaft extends to the upper side and the lower side of the fixing plate correspondingly, the upper end of the rotating shaft is connected with a rotating part, the adjusting plate is connected to the lower end of the rotating shaft, and the lower end of the rotating shaft is connected with the circle center position of the adjusting plate.