Abstract: An antibacterial modified polyurethane resin is provided. The antibacterial modified polyurethane resin includes a polyurethane resin and an antibacterial modifying agent grafted on the polyurethane resin. The antibacterial modifying agent has formula (I) as follows: R1 is a substituent of —(CH2)a—, R2 is a substituent of —(CH2)bCH3—, a is a positive integer that is greater than or equal to 3, and b is a positive integer that is greater than or equal to 12. The antibacterial modifying agent has three methoxyl groups, at least two of the three methoxyl groups bond to the polyurethane resin through covalent bonds. In the antibacterial modified polyurethane resin, a chloride ion of the antibacterial modifying agent is configured to be ionized, so that a nitrogen atom is configured to be positively charged to attract a bacteria in an environment.