The invention discloses an aspergillus niger strain and application thereof. A collection name of the aspergillus niger is aspergillus niger JS-1; the collection unit is the China Center for Type Culture Collection; the collection address is Wuhan University, Wuhan, China; the collection date is January 11, 2017; the collection number is CCTCC M 2017024. Experiments prove that the aspergillus niger strain has a fairly strong magnaporthe grisea antagonism, and the fermented liquid of the aspergillus niger strain has a strong antibacterial effect on rice blast; the aspergillus niger strain can be used for preparing a rice blast bacteriostatic agent; a new option is provide for developing new rice blast biocontrol bacteria and a bactericide; and the economic and social benefits are perfect.