The invention provides Bifidobacterium pseudocatenatum and application thereof in metabolic syndrome, and relates to the field of microorganisms. The preservation number of the Bifidobacterium pseudocatenatum is CGMCC No.22185, the Bifidobacterium pseudocatenatum is preserved in China General Microbiological Culture Collection Center on April 14, 2021, and the preservation address is Institute of Microbiology, Chinese Academy of Sciences, No. 3, Beichen West Road, Chaoyang District, Beijing. According to the Bifidobacterium pseudocatenatum, the accumulation of liver cell lipid can be significantly inhibited, the body weight and the blood fat level can be reduced, the liver fatty degeneration can be further improved, and the important application significance can be provided for the alleviation of the occurrence of hyperlipidemia, obesity and fatty liver.