The invention provides a high-strength alloy for a socket. The high-strength alloy comprises the following components in percentage by weight: 24-26% of zinc, 2.5-3.5% of aluminum, 0.2-0.5% of phosphorus, 2.5-3.5% of titanium, 0.5-0.8% of tin, 1-3% of zirconium, and the balance of copper. The present invention also provides a preparation method of the high-strength alloy for the socket, which comprises the steps of smelting, draw-casting, hot rolling, solid solution, finish rolling, aging treatment, and so on. The high-strength alloy for the socket provided by the present invention has relatively high tensile strength, and also is excellent in such properties as electrical conductivity, elasticity and hardness; the high-strength alloy is substantially the same as or superior to common tin-phosphorus-bronze material in properties, and capable of completely meeting the requirements of a socket plug bush on a material, and thus is a highly appropriate substitute material; and the amount of a noble metal used is low, such that the cost can be greatly reduced; meanwhile, the preparation method of the high-strength alloy for the socket provided by the present invention is simple, feasible, and suitable for industrial large-scale production.