Method for breeding lasting disease-resistant hybrid rice mixing line

The invention discloses a method for breeding a lasting disease-resistant hybrid rice mixing line and belongs to the field of hybrid rice disease resistance breeding. A plurality of resistance genes are led into an excellent maintenance line through a molecular marker auxiliary back cross breeding method, and a disease-resistant sterile line containing heterozygous disease-resistant genes is obtained through the breeding of the maintenance line and an original sterile line. Hybrids containing equal-proportion multiple disease-resistant gene combinations can be obtained by production of hybrid seeds from the disease-resistant sterile line and a restoring line. The hybrids are composed of single plants containing multiple resistance genes, single plants containing single resistance genes and disease-resistant single plants. The hybrids are mixed populations of various resistance level plants, selection pressure on pathogenic bacteria caused by vertical resistance can be avoided or reduced, and the goal of lasti