The invention relates to the technical field of breeding of crops and especially discloses a genic male sterile line of a radish and a breeding method thereof. The genic male sterile line of the radish is characterized in that the sterile line is a male sterile line controlled by a pair of recessive genic genes; the inheritance of fertility of the line is stable and not influenced by factors like environment; development of gynoecia is normal, stamens completely degenerate, and effective pollen does not exist; and the line is preserved in China Center for Type Culture Collection, Wuhan University, Hubei Province, China on October 26th, 2014, with an accession number of P201411 and is classified and named as 136 S. The genic male sterile line and the breeding method thereof in the invention make a breakthrough to limitation to the type of cytoplasmic male sterility in conventional male sterile lines of the radish and open up a novel approach for breeding of male sterile lines of the radish; and the discovered genic male sterile line is of great significance to overcoming of the problem of a single gene of the male sterile lines of the radish.