Novel paenibacillus strain with nitrogen fixation and siderophore production functions and application of novel paenibacillus strain

The invention discloses a novel paenibacillus strain with nitrogen fixation and siderophore production functions and application of the novel paenibacillus strain, and belongs to the field of microorganisms. The new paenibacillus strain is named as Paenibacillus sp.C31, the new paenibacillus strain is preserved in the China Center for Type Culture Collection on December 9, 2021, and the preservation number is CCTCC (China Center for Type Culture Collection) NO: M20211582. According to the invention, the strain is determined to be a new strain belonging to Paenibacillus sp. (Paenibacillus sp.) according to strain morphology, physiological and biochemical characteristics and phylogenetic analysis. The strain has the nitrogen fixation capacity and the siderophore secretion function, and the function can be used for preparing a microbial agent to improve the utilization efficiency of plants on soil nitrogen and iron elements, so that plant growth is promoted, meanwhile, the use amount of chemical fertilizers in a