Creating method of wide-compatibility novel tetraploid rice with especially big rice heads

The invention discloses a creating method of wide-compatibility novel tetraploid rice with especially big rice heads. The method comprises the following steps of performing hybridization by using autotetraploid rice carrying pollen fertility 'neutral gene' and megaspore wide-compatibility S5n as a male parent and using autotetraploid indica type rice carrying megaspore wide-compatibility S5n as afemale parent so as to obtain a generation F1; performing self crossing on the generation F1 to the generation F16; selecting single plants with the main rice head length being exceeding 20cm and thefruiting rate exceeding 50 percent in each generation; selecting single plants with the main rice head length being exceeding 30cm, the head particle number exceeding 200 and the fruiting rate exceeding 60 percent in the generation F17; continuously performing self crossing to the generation F21; selecting the single plants with the main rice head length being exceeding 35cm, the head particle number exceeding 250 and the