A shorts type diaper comprises a skin contact portion and a combination portion arranged on the skin contact portion. The skin contact portion comprises an in-leg area, a front waistline area, a rear waistline area, a left thigh width area and a right thigh width area, wherein the front waistline area and the rear waistline area are arranged at two ends of the in-leg area respectively, and the left thigh width area and the right thigh width area are arranged on two sides of the in-leg area respectively. The skin contact portion comprises an inner surface piece, a liquid absorption core and an outer surface piece which are overlaid sequentially in the thickness direction. When the shorts type diaper is used, the inner surface piece is arranged on the side close to the body. An opening is arranged on the in-leg area and extends along the directions of the front waistline area and the rear waistline area to form a long and narrow shape. An adjusting mechanism is arranged on the outer surface piece and used for opening and closing the opening. Different functional forms of the shorts type diaper can be selected according to specific environments. Therefore, the shorts type diaper is convenient and applicable.