Antimony-containing alterant for zinc-copper alloy and modification treatment method

The invention provides a method for modifying a zinc-copper alloy by using antimony; the alterant is antimony with the purity of 99.20-99.99wt.% or zinc-antimony intermediate alloy with the antimony mass percent of 10-20%; the modifier is added in the process of alloy smelting treatment, so that the growth of epsilon phase can be inhibited, thereby increasing the number of epsilon phase crystal nuclei, reducing the grain size and branching of epsilon phase, and leading the epsilon phase crystal nuclei to be more uniformly distributed in an alloy matrix. Meanwhile, the modification treatment method has simple process and convenient operation.