The double-layer antibacterial pipe is a sanitary-grade pipe with a composite structure design. The inner and outer layers are made of medical-grade polymer materials and nano-antibacterial coating composite technology. The inner layer is a nano-silver ion antibacterial layer to achieve continuous antibacterial effect, which can effectively inhibit the growth of more than 99% of common bacteria (such as Escherichia coli and Staphylococcus aureus).