An apparatus for producing magnetized water. The apparatus comprises a plurality of magnet bars arranged in a radial manner, in which each magnet bar is structured such that a plurality of neodymium based permanent magnets is stacked in a stainless steel pipe in a manner such that like poles of the permanent magnets face each other. Thanks to this structure, the apparatus has a large contact area between the magnetic field and water flowing through the apparatus, thereby activating water by changing the structure of water. In more detail, the apparatus comprises a magnet bunch including a plurality of fixed magnet bars, a plurality of standard magnet bars, an upper plate disposed on upper ends of the fixed and standard magnet bars, a lower plate disposed on lower ends of the fixed and standard magnet bars, and a spacing plate disposed between the upper and lower plates; a housing having a cylindrical main body for enclosing the magnet bunch therein, an opening in an upper end portion thereof, and a lower part having a funnel shape and a liquid passage; and a cover 50 for covering the opening of the housing, the cover being coupled to the housing in a detachable manner and having a funnel shape and a liquid passage.