The invention relates to the field of electroplating, and provides zinc nickel and nickel tungsten electroplating liquid and a preparing method and an electroplating method of the electroplating liquid. Raw materials of each liter of electroplating liquid comprise 10 to 35g of nickel sulfate, 45 to 70g of sodium hydroxide, 3 to 12g of sodium tungstate, 5 to 12g of zinc powder, 0.1 to 1.5g of an addition agent A, 0.1 to 0.8g of an addition agent B, 15 to 50 g of a complexing agent and the balance deionized water. The electroplating method comprises the steps that a pure iron plate serves as ananode, a part to be electroplated serves as a cathode, the anode and the cathode are inserted in the zinc nickel and nickel tungsten electroplating liquid, under the first current density, electroplating is carried out, then, the first current density is converted into second current density with the current density higher than the first current density, electroplating is carried out, and a zinc nickel and nickel tungsten dual-layer plating can be obtained. The dual-layer plating can be obtained at one time, and the dual-layer plating can be used for preventing chemical corrosion, electrochemical corrosion and physical wear at the same time.