Lanthanum trichloride can be used as an analytical reagent and can be used as a raw material for extracting metal lanthanum and as a petroleum cracking catalyst. Lanthanum chloride also has a certain role in the field of medicine. For example, studies have shown that the antagonistic effect of lanthanum chloride on endotoxin (LPS) in vivo effects has a certain impact on the search for new effective endotoxin antagonists, providing experimental evidence for the prevention and treatment of endotoxemia.