The invention discloses a cutting method of a female suit pants prototype. The cutting method sequentially comprises the following steps of: step 1, measuring the outside length, the waistline, the hipline, the crotch depth and the hip thickness of a human body; step 2, determining the total crotch width of the female suit pants prototype, wherein the total crotch width is equal to [(hip thickness * 0.44) + 6.34] cm; step 3, determining the front crotch width and the rear crotch width of the female suit pants prototype, wherein the front crotch width is equal to [(total crotch width * 1 / 3) + 0.5] cm, and the rear crotch width is equal to [(total crotch width * 2 / 3) - 0.5] cm; step 4, determining a cutting curve of a pair of female suit pants; and step 5, cutting and sewing according to the cutting curve, wherein 'cm' is adopted as a measure unit for length values of the outside length, the waistline, the hipline, the crotch depth and the hip thickness. According to the cutting method disclosed by the invention, a structure relation and a motion relation between the crotch width and the human body of the pair of female suit pants can be accurately presented, and the cutting efficiency of the pair of female suit pants can be effectively increased.