The invention provides a preparation method of zinc phosphate for a water-based anticorrosive coating. According to the preparation method of zinc phosphate of the water-based anticorrosive coating, zinc oxide particles are doped with trace metal oxide particles; the activity of metal elements in the metal oxide is higher than that of a protected metal material; the activity of the zinc phosphateis higher than that of the protected metal material, so that the metal oxide and the protected metal form a corrosion galvanic couple, and the zinc phosphate contains metal ions with better activity than that of the protected metal, so that the protected metal can be used as a cathode, electron loss is avoided, and a better anti-corrosion effect can be achieved.