The invention relates to a semi-worsted porous segment color slub yarn. The semi-worsted porous segment color slub yarn is prepared from base yarn and decorative yarn, wherein the base yarn is prepared from prolivon fibers, spun silk fibers and wool fibers, and the decorative yarn is prepared from aloe viscose fibers and antibacterial hollow polyester fibers. The slub yarn prepared through the method is colorful, rich in color, changeable in pattern, unique in style, rich in layer change and special in shape, and can generate a flash effect after the fibers in different colors are combined into threads; due to the fact that the yarn is rich in color and diversified in shape change, a fabric manufactured through processing is antibacterial, capable of diminishing inflammation, protecting skin and beautifying the face, good in moisture absorption and good in dyeing property and elasticity, does not generate adverse reactions when making contact with the human body, and is not easy to damage by worms or rot, unique in appearance, good in drapability, good in comfort degree, good in abrasion resistance, natural in color and wide in application range; the processed fabric is strange in style and has the health-care functions of resisting bacteria, protecting the skin, strengthening the body, beautifying the face, moisturizing the skin, being good in comfort degree and the like.