The present invention discloses a novel ultra low molecular weight heparin, wherein heparinase SDhep II obtained from Sphingobacterium daejeonense is utilized, and heparin degradation, ultra-filtration separation, ethanol precipitation and other steps are performed to finally obtain the novel ultra low molecular weight heparin. According to the present invention, the novel ultra low molecular weight heparin has specificity in the anticoagulation field, and is expected to be the active component of the clinical anticoagulation drug.