The invention discloses a liquid magnetizer with a variant Halbach permanent magnet array. The liquid magnetizer with the variant Halbach permanent magnet array structurally comprises a shell, a permanent magnet device, a liquid conveying pipe and a liquid distributor, wherein the permanent magnet device consists of 3-9 groups of annular permanent magnet arrays and jackets thereof; each group of annular permanent magnet arrays is formed by assigning 4n (n=1, 2, 3,...) trapezoidal or square (or square and triangular) permanent magnet components according to a Halbach array; radial magnetizing components between each two magnetic rings are mutually staggered and arranged spirally; the liquid conveying pipe is made of a nonferrous thin-wall material; the outer wall of the liquid conveying pipe is tightly stick to the permanent magnet device; the inner wall of the liquid conveying pipe and the liquid distributor form an annular passage; and the liquid distributor is of a hollow columnar structure, is internally filled with far-infrared activating balls, specially-made mineralizing balls and pure natural tourmalines, and is communicated with a stream current by virtue of permeable holes. The liquid magnetizer with the variant Halbach permanent magnet array has strong magnetism collecting capability and no magnetized dead angles, also has the effects of magnetization, activation, mineralization and weak alkalization, and can be widely applied to the treatment of water, beverages and other liquids.