Provided is an antibacterial water treatment agent using polyethylene containing silver zeolite which offers various benefits such as being very safe, wherein such antibacterial water treatment agent is characterized in that the silver zeolite has a type-A crystalline structure and is contained by 10 to 60 percent by weight, and the antibacterial water treatment agent is a porous body having continuous holes formed from the silver zeolite to the surface of the antibacterial water treatment agent, wherein the continuous holes are created by vaporization of crystallization water contained in the silver zeolite.
