The invention discloses a hip circumference measuring device. The hip circumference measuring device comprises a collecting device and measuring suspender trousers, wherein the measuring suspender trousers comprise straps, the collecting device comprises a base, camera support posts, cameras and a telescopic holding rod, the camera support posts and the telescopic holding rod are arranged on the base, the cameras are mounted on the camera support posts, the telescopic holding rod is arranged on the base, positioning footprints are arranged at the central position of the base, and the telescopic holding rod and the positioning footprints are matched with each other; and a grid-shaped pattern is printed on the measuring suspender trousers, a first marking line is arranged at the position, close to a waistband, of the measuring suspender trousers, a second marking line is arranged at the crotch of the measuring suspender trousers, velcro tapes are sewn to the straps, and the first markingline and the second marking line are matched with the velcro tapes. Through the technical scheme, a theoretical basis is provided for the structural design of lower garments for different waist, abdomen and hip figures, so that the waist, abdomen and hip structures of the lower garments are closely combined with the figure characteristics of the human body, then the fitness of the lower garmentsis improved, and thus the demands of consumers for wearing are satisfied.