Rebaudioside B sodium salt crystal form A, and preparation method, food composition and application thereof

The invention belongs to the technical field of sweetening agents, in particular to a rebaudioside B sodium salt crystal form A, a preparation method, a food composition and application thereof. According to the X-ray powder diffraction analysis obtained by measuring the rebaudioside B sodium salt crystal form A through Cu-K alpha ray, the 2 theta value represented by degree has obvious characteristic diffraction peaks at the degrees of 4.89, 6.44, 15.91, 19.63 and 29.09. The preparation method provided by the invention is simple in process, easy to operate, more in selectivity, the rebaudioside B sodium salt crystal form A can be obtained through multiple methods, and the obtained product is high in crystallinity, good in water solubility, low in hygroscopicity, high in stability and good in mobility.