The invention discloses a nickel-based positive electrode material of a lithium secondary battery and a preparation method of the nickel-based positive electrode material, the chemical formula of the positive electrode material is Lia (NixMy) (1-z) NzO2. Fb, M is at least one of Co, Mn, Al or Mg; n is at least one of Ba, Mo, Ce, Al, Zr, Mg, Ti, Sr, Y, W or La; f is a LiSiAlWO7 compound; wherein 0.90 < = a < = 1.20, 0.1 < = x < = 1.0, 0 < = y < = 0.9, x + y = 1, 0.001 < = z < = 0.010, and 0.001 < = b < = 0.050. The preparation process of the positive electrode material has the advantages of simple process flow, high productivity, no ammonia or alkali in raw materials, and facilitation of wastewater recovery; the product has excellent comprehensive performance and the like, and a new low-cost high-performance lithium secondary battery positive electrode material is provided for large-scale application of new energy automobiles.