Abstract: Cathodic hydrogen charging was conducted on the as-cast Mg-14Li alloy with hydrogen charging times of 0-18 h.The surface morphology and tensile properties of the alloy before and after hydrogen charging were compared and analyzed.The results show that pitting corrosion occurred on the surface of as-cast Mg-14Li alloy after cathodic hydrogen charging, and the LiCO₃ corrosion product film was destroyed.The depth of corrosion pits and the quantity of corrosion products increased with the hydrogen charging time.However, no microcracks were found in the alloy after hydrogen charging, indicating that the hydrogen embrittlement sensitivity of β-Li phase was low.With the increase of hydrogen charging time, the yield strength, tensile strength and percentage elongation after fracture of as-cast Mg-14Li alloy decreased, and the dimples on the fracture surface decreased and the cleavage surface increased in amount, indicating that the fracture mode of as-cast Mg-14Li alloy changed from ductile fracture to brittle fracture.