A hollow packaging paper box comprises an outer box body and an inner core body, the outer box body comprises an upper end portion, a lower end portion, a front baffle connected between the upper end portion and the lower end portion and a rear baffle connected through a buckle structure, the two sides of the outer box body are hollowed out, the inner core body is movably clamped into the outer box body, and a plurality of object clamping grooves are formed in the two sides of the inner core body. And the top end and the bottom end of the inner core body are clamped into the upper end part and the lower end part of the outer box body. According to the packaging paper box suitable for stably packaging, positioning and clamping the underpants, through the overall structural design of the inner core paper board and the outer box body, the overall stable clamping effect is completed, meanwhile, the convenience of opening is facilitated, and the packaging paper box is convenient to use through the unique and meticulous structural design. The product is convenient to store, fabric can be conveniently displayed, materials of the paper box are saved, the packaging size is small, and transportation and storage are convenient.