The invention provides bacillus safensis X3 and application thereof, belonging to the technical field of new use of microorganisms. The bacillus safensis X3 has an ability to degrade phosphorus, and the concentration of the degraded phosphorus reaches 476.6mg/L or above; the difficult-to-use phosphorus is converted into available phosphorus, so that the content of the available phosphorus in the soil is effectively increased, the utilization rate of fertilizer is improved, and the growth and development and fertilizer absorption of plants are promoted; furthermore, the concentration of indoleacetic acid produced by the bacillus safensis X3 is 34.78mu g/mL or above. The bacillus safensis X3 is applied to plant cultivation, and can significantly improve the yield and quality of grain crops such as wheat and corn, oil crops such as peanut, and cash crop such as tobacco.