The invention discloses an improved trousers air-drying device. Through attraction and pushing of electromagnet devices arranged in lower shells of retractable rods on two sides, two sides of a trousers end of trousers are clamped, two retractable rods in the middle respectively extend into two sides of trouser legs under the effect of a control driving device, a motor in a shell at the lower end of the driving device rotates, a rotating cam pushes a sliding block to clamp the bottom end of the trouser legs; when the trousers require to be overturned, a singlechip in the control driving device controls the retractable rods on the two sides to extend downwards, the two retractable rods in the middle are controlled to retract upwards, then the inside of the trousers can be overturned, and therefore, automatic overturning of the trousers is realized; and two surfaces of the trousers can be irradiated by sunlight, effective ultraviolet ray sterilization is carried out, air-drying efficiency is guaranteed, and the circumstances that the inside of the air-dried trousers are moist due to the fact that the inside of the trousers is not irradiated by the sunlight, and health of human bodies is affected are avoided.