The invention discloses a preparation method of a Zn-Al alloy with high wear resistance. The Zn-Al alloy comprises 25%-35% of Al, 0.5%-1.5% of Cu and the balance of Zn. With adoption of a spray forming technology and non-restricted gas flow atomization nozzles, atomized gas sprayed by the gas flow atomization nozzles is used for spray forming of alloy melts flowing out of a flow guide pipe, and a forming product is deposited on a receiving disc of a receiving device, wherein spray forming process parameters are as follows: nitrogen is adopted as the atomized gas, the atomization pressure is 0.6-0.8 MPa, the temperature of the alloy melts is 973-1073 K, the depositing distance between the outlet of the flow guide pipe to the receiving disc is 400-500 mm, the temperature of the flow guide pipe is 973-1073 K, the scanning frequency of an atomizer is 1-5 Hz, the dropping speed of the receiving device is 20 mm/min, and the dropping angle of the receiving device is 30 degrees. The method can refine the Zn-Al eutectoid phase of an alloy structure, improve the wear resistance of the alloy and eliminate massive eutectoid structures in casting alloys.