Magnesium alloy sacrificial anode is a practical application product of magnesium metal, mainly used for cathodic protection of a kind of anti-corrosion material magnesium alloy products, widely used in ships, docks, oil and gas pipelines, urban pipe networks and other underwater underground steel structure facilities and electrical protection. Its anti-corrosion protection process is a long process of self-sacrifice, its basic principle of anti-corrosion protection is to sacrifice the anode to protect the cathode, that is, the more negative potential of the metal (that is, the anode) and the protected metal (that is, the cathode) wire is connected, and in the same electrolyte, so that the metal (that is, the anode) on the electron transfer to the protected metal (that is, the cathode) up. The protected metal (that is, the cathode) atoms are not easy to lose electrons and become ions (metal corrosion is the process of atoms losing electrons to become ions), so that the cathode (metal facilities) are protected. And, of course, the sacrificial anode of its material. Therefore, the quality (anti-corrosion) performance of magnesium alloy sacrificial anodes mainly depends on the chemical composition and its proportion and internal structure