A high-entropy alloy film, the composition of which includes titanium, zirconium, niobium, tantalum and iron. The high-entropy alloy film is made with a combination of elements with high biocompatibility, and its formation of non-crystalline structure is further improved by adding iron. Furthermore, as the content of titanium in the high-entropy alloy film is adjusted, the microstructure, mechanical properties, and corrosion resistance of the high-entropy alloy film is changed as well.