<p>To improve the corrosion resistance of Mg-Zn-Ca-based metallic glasses (MGs) for biomedical applications, a series of (Mg₆₆Zn₃₀Ca₄)_100-<i>x</i>Sr_<i>x</i> (<i>x</i> = 0, 0.3, 0.5, 0.7, 1.0) MGs were prepared using copper mold injection, and the effect of Sr content on their corrosion behavior in simulated body fluid (SBF) was systematically examined. The results showed that the alloy with 0.3 at.% Sr exhibits the best corrosion resistance, with an average corrosion rate of 0.217&#xa0;mm · y⁻¹ and a corrosion current density of 3.08&#xa0;<i>μ</i>A · cm⁻². This alloy helps to form a dense corrosion product layer on the sample surface, thereby inhibiting the occurrence of local corrosion. The addition of 0.3 at.% Sr improved the corrosion resistance of Mg-Zn-Ca MGs, providing a new strategy for their application as a biodegradable metallic material.</p>