The spinning process of ultra-fine polypropylene staple fiber should be determined according to the raw material. The length of the raw material used for spinning of ultra-fine polypropylene staple fiber is cotton type. Therefore, the cotton spinning system is used for spinning, and it is easy to generate static electricity and stick when processing polypropylene staple fiber. When mixing materials, it can be suitable for wetting and refueling to reduce the friction factor of the fiber surface. Effective anti-sticking measures should be adopted. The opening and cleaning process should reduce the distance between dust rods to reduce noil, and enlarge the distance between beaters and dust rods. To reduce fiber damage and rubbing, the selection of carding elements on the carding machine should be compatible with the characteristics of polypropylene staple fibers. The selection of large-angle, shallow-tooth, curved-back needles and doffer clothings should be adapted to the carding process. Dosage, slow speed, large gauge technology, anti-ultra-fine polypropylene staple fiber yarn should reduce the amount of carding, reduce the carding strength of the licker roller, reduce the average carding time of the fiber and choose the appropriate card clothing, etc., drawing process It adopts measures such as heavy pressure, large gauge, smooth passage, anti-winding and anti-blocking, and the roving spinning process adopts the principles of large gauge, heavy pressure, small tension, and small twist coefficient.