The invention relates to the technical field of plastic pipe fittings, in particular to an antibacterial and flame-retardant polypropylene pipe fitting and a preparing method thereof. The pipe fittingis prepared from, by weight, 70-90 parts of polypropylene, 0.5-1.0 part of compound antibacterial agent, 1.5-3.5 parts of flame retardant, 0.3-0.8 part of antioxidant and 1.0-3.0 parts of thermal stabilizer. By selecting the proper raw materials and adding the compound antibacterial agent and the compound flame retardant, the polypropylene material with flame-retardant and antibacterial compoundperformance is obtained; meanwhile, by adding the antioxidant, the thermal stabilizer and other auxiliaries, the processing performance of the antibacterial and flame-retardant polypropylene materialcan be improved, the thermal resistance and ageing resistance of the material are improved, and the service life of the pipe fitting can be effectively prolonged.