The invention relates to antibacterial reinforced HDPE (high-density polyethylene) pipeline functional master batch and a method for preparing the same. The antibacterial reinforced HDPE pipeline functional master batch comprises HDPE resin, tetrapod-shaped zinc oxide whiskers, inorganic nanometer antibacterial agents, water-based dispersing agents and water-based coupling agents. The antibacterial reinforced HDPE pipeline functional master batch and the method have the advantages that the problem of difficulty in dispersing nanometer materials and the problem of particle aggregation can be effectively solved by the aid of a special process for preparing the inorganic nanometer antibacterial agents and a special nanometer dispersing process, accordingly, the tetrapod-shaped zinc oxide whiskers and the inorganic nanometer antibacterial agents can be uniformly dispersed in the antibacterial reinforced HDPE pipeline functional master batch, the antibacterial reinforced HDPE pipeline functional master batch is excellent in antibacterial performance, and the tensile yield strength and the notch impact strength of the antibacterial reinforced HDPE pipeline functional master batch can be obviously improved; perfect effects can be realized by the antibacterial performance, the compressive strength and the ring stiffness of products if 5-15% of the antibacterial reinforced HDPE pipeline functional master batch is added into the HDPE pipeline products.