The invention discloses an antibacterial building plastic pipe. The antibacterial building plastic pipe is composed of the following raw materials in parts by weight: 96 to 103 parts of SG-5 type PVC, 0.2 to 0.9 part of isocetyl stearate, 1 to 4 parts of calcium stearate, 1 to 5 parts of styrene, 0.5 to 1.8 parts of isopropyl tri (dioctylpyrophosphato) titanate, 0.6 to 3.4 parts of an antioxidant, and 2 to 4 parts of an antibacterial agent. The antibacterial building plastic pipe is better in mechanical property, high in strength, good in antibacterial property, light in weight, and convenient to install and use, does not need to be frequently maintained, and can be widely applied to building water supply and drainage, electrical threading pipes, communication pipes and the like.