The invention provides bacillus high temperature bacteria NJAU-N30 for accelerating composting and decomposition and a process for preparing an organic fertilizer by fermentation acceleration throughthe same. A strain has an accession number of CGMCC No. 16736, and the application of the strain is to accelerate composting and fermentation. The process includes the steps of evenly mixing livestockmanure and auxiliary materials according to a certain C/N and then inoculating liquid strains; after forming a stack, adopting a stack type fermentation process, and turning over and fermenting. Compared with a control of no adding of strains, the strain adding effectively promotes the rise in temperature of a stack body at an early stage of composting, the stack body is urged to enter a coolingperiod ahead of time, and the improvement of a compost product germination index and the like is promoted. A prepared organic fertilizer can effectively promote the growth of plants.