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Highly nutritious traditional plants which are rich in bioactive substances are attracting increasing attention. In this study, the nutritional value, chemical composition, biological activities, and feed indices of different parts of <i>Millettia speciosa</i> were comprehensively evaluated. In terms of its nutritional value, this study demonstrated that the leaves, flowers and seeds of <i>M. speciosa</i> were rich in elements and amino acids; the biological values (BVs) of these ingredients ranged from 85% to 100%, showing the extremely high nutritional value of this plant. GC-MS analysis suggested that the main chemical components of the flower volatile oil were <i>n</i>-hexadecanoic acid (21.73%), tetracosane (19.96%), and pentacosane (5.86%). The antibacterial activities of the flower and seed extracts were significantly stronger than those of the leaves and branches. The leaf extract displayed the strongest antifungal activities (EC₅₀ values: 18.28 ± 0.54 μg/mL for <i>Pseudocryphonectria elaeocarpicola</i> and 568.21 ± 33.60 μg/mL for <i>Colletotrichum gloeosporioides</i>) and were the least toxic to mouse fibroblasts (L929) (IC₅₀ value: 0.71 ± 0.04 mg/mL), while flowers were the most toxic (IC₅₀ value: 0.27 ± 0.03 mg/mL). In addition, the abundance of fiber, protein, mineral elements, and functional metabolite contents indicated the potential applicability of <i>M. speciosa</i> as an animal feed. In conclusion, as a traditional herbal plant used for medicinal and food purposes, <i>M. speciosa</i> shows potential for safe and multifunctional development.