Multifunctional alloy liquid protection device

The utility model provides a multifunctional alloy liquid protection device, which belongs to the field of alloy smelting and comprises a smelting crucible, a protection cover and a protection gas cylinder. The protective cover is arranged on the smelting crucible and comprises an upper cover body and a lower cover body, a first air inlet is formed in the upper cover body, a cross-shaped ventilation pipeline and a first annular ventilation pipeline are arranged at the top of an inner cavity of the upper cover body, a second air inlet is formed in the lower cover body, and a second air inlet is formed in the lower cover body. A second annular ventilation pipeline and a third annular ventilation pipeline are arranged at the end, close to the upper cover body, of the inner cavity of the lower cover body, and the protective gas cylinder is filled with protective gas. The smelting crucible has the advantages that alloy liquid is protected, the liquid level condition of the alloy liquid in the smelting crucible can