Provided is a soybean oligosaccharide product containing acidic soluble saccharides of soybean and probiotics, which at least include fructose, glucose, sucrose, raffinose, and stachyose, with a percentage of the combined weight of raffinose and stachyose being at least 46%, a weight percentage of fructose being not greater than 8.5%, and a weight percentage of glucose being not greater than 1.0%, based on the total weight of fructose, glucose, sucrose, raffinose, and stachyose. The soybean oligosaccharide product is prepared by extracting a soybean raw material with water under a pH of 3-6 and at a temperature of 50-70° C. to obtain an extract containing acidic soluble saccharides of soybean, and inoculating and fermenting the extract with probiotics that are able to decompose monosaccharides and disaccharides, but substantially not able to decompose trisaccharides or tetrasaccharides.
