High-strength zinc alloy material and preparation method thereof

The invention discloses a high-strength zinc alloy material and a preparation method thereof. The preparation method comprises the following steps: melting pure Zn, adding pure Cu, adding a charcoal covering, heating to 650 +/-3 DEG C, uniformly stirring and mixing after the Cu is completely melted, adding pure Al, melting, heating to 750-790 DEG C, sequentially pressing a flaky intermediate alloy into liquid metal, melting, cooling to 650 +/-3 DEG C, adding pure Mg, melting Mg, uniformly stirring and mixing, standing for 5 minutes, cooling to 500 +/-3 DEG C, and pulling out slag. Pouring into a metal mold, opening the mold when the mold temperature is less than 150 DEG C, taking out the as-cast Zn alloy, and naturally cooling; and carrying out solid solution heat preservation on the as-cast Zn alloy at 300-360 DEG C for 3-9 hours, and carrying out water cooling to obtain the high-strength zinc alloy material. The high-strength zinc alloy material is obtained by selecting the types and contents of alloying el