The invention discloses an antibacterial water treatment material and a preparing method thereof.The antibacterial water treatment material is prepared from, by weight, 50-58 parts of polyvinyl butyral, 6-9 parts of chitosan fibers, 5-7 parts of diisobutyl phthalate, 2-3 parts of phenoxyethanol, 1-2 parts of 1,8-diazabicyclo(5,4,0)7-hendecene, 0.8-1 part of peroxide terephthaloyl, 0.5-1 part of 5,6,7,3',4'-pentamethoxyl flavone, 0.5-0.8 part of zinc borate, 0.2-0.5 part of ammonium oxalate, 0.2-0.3 part of aluminum sulfate and 0.8-0.5 part of perillaldehyde.The invention further provides the preparing method of the antibacterial water treatment material.