The invention particularly discloses a molten metal wetting test device which comprises a sealed hollow cavity. A substrate platform for placing a substrate to be tested is mounted at the bottom of the cavity, a cooling liquid circulation channel is formed in the substrate platform and used for performing constant temperature or cooling on the substrate to be tested, the substrate to be tested isdetachably and horizontally fixed on the substrate platform, a container for placing a metal to be tested is mounted above the substrate platform in the cavity, a through hole is formed in the end surface of the container opposite to the substrate platform, melt liquid drops of the metal to be tested penetrate the through hole, the outer wall of the contained is wound with electromagnetic induction coils for heating the metal to be tested, transmitting glass for internally peeping is mounted on the wall surface of the cavity, the mounting position of the transmitting glass and the substrate platform are positioned on the same horizontal plane, the height of the transmitting glass is higher than or equal to the distance between the substrate platform and the container, a pipeline is mountedin the cavity, and the cavity and the container are pumped into vacuum by the pipeline. The wetting performances of molten metal on the low-temperature solid surface can be accurately measured.