The invention discloses a method for preparing calcium carbonate solidified sandy soil by means of microorganisms. The method comprises the following steps that sand is poured into a bottle, and the bottom of the bottle is evenly covered with the sand; then jellying liquid and a cultured bacteria solution are poured into the bottle, and constant-temperature shake culturing is conducted; subsequently, a fixed amount of a mixed solution in the bottle is sucked daily, and then an equal amount of the jellying liquid is added while a small amount of sand is also evenly added into the bottle; and finally, solidified sand posts are obtained after several days of same operation. The method for preparing the calcium carbonate solidified sandy soil by means of the microorganisms has the advantages that the microorganisms and nutrient solution resources can be fully utilized, the process is simple, the environment is clean, and the cost is low; and the finally obtained solidified sand posts are uniform in the whole and free of layering, the vertical strength is even, and the strength is high.