The invention relates to an antibacterial medical catheter. The antibacterial medical catheter comprises a catheter body; an antibacterial coating is coated on inner and outer surfaces of the catheter body respectively and comprises an antibacterial agent and high polymer used as an antibacterial agent carrier, wherein the antibacterial agent accounts for 0.05 to 10 percent based on the total mass of the antibacterial coating. The invention also provides a preparation method for the antibacterial medical catheter. The method comprises the following steps of: treating the surface of a medical catheter; preparing a carrier solution; preparing an antibacterial solution, namely adding the antibacterial agent into the carrier solution, and stirring until a mixture is dispersed uniformly to obtain the antibacterial solution; forming a film, namely immersing the medical catheter of which the surface is treated in the antibacterial solution, and then lifting the medical catheter slowly to ensure that the antibacterial solution naturally flows along the surface of the medical catheter to form the uniform and smooth antibacterial coating; and drying. The antibacterial coating containing antibacterial components is deposited on the surface of the medical catheter and can effectively inhibit the growth of bacteria and exert the good antibacterial capacity for a long time.