A polypoind rice photothermally-sensitive cytoplasmic male sterility line breeding method. The method comprises: a. determining a diploid rice line having photothermally-sensitive cytoplasmic male sterility and PMeS characteristics to serve as a parent; b. hybridizing the determined photothermally-sensitive cytoplasmic male sterility line with a diploid PMeS genetic line, culturing a hybridized plant seedling into a doubled hybrid tetraploid; c. backcrossing the hybridized tetraploid with a tetraploid photothermally-sensitive cytoplasmic male sterility line; d. selecting from backcrossing offsprings a tetraploid male sterile line, crossbreeding with another tetraploid rice line having PMeS genes after self-breeding during a period of low temperatures and short sun exposure; g. selecting the tetraploid male sterile line, detecting the stability of the tetraploid male sterile line after successive self-breeding; and I, determining the tetraploid rice sterile line consistent in stability as a tetraploid rice pho
