The present invention relates to a strain of Salmonella abortus equine ( Salmonella abortus equi ) SMXJ‑97 CGMCC No.9047, which has the 16S rRNA gene sequence in Sequence Table 1; the strain was isolated from aborted horses in Xinjiang, and the bacteria were straight rod-shaped, with a size of 0.7~1.6μm×2.0~5μm, Gram Stain negative. It is an aerobic and facultative anaerobic bacterium, which can grow on ordinary culture medium. The growth temperature is from 25°C to 40°C, the optimum temperature is 37°C, the pH growth range is 5-9, and the optimum pH is 7.4-7.6. It can ferment mannitol, decompose lysine, but not urea, and cannot use tryptophan, malonate, salicin, and sorbitol. The strain can be used to prepare an inactivated vaccine against salmonellosis in equine abortion. The vaccine prepared by the bacterial strain has good pertinence, low cost, safety and good protection effect.