Planting method of saline-alkali tolerant rice in crab-rice symbiotic field

The invention discloses a planting method of saline-alkali tolerant rice in a crab-rice symbiotic field. The planting method comprises the following steps: step one, selecting a proper rice field, transforming the selected rice field, digging an annular ditch, forming a ridge by using soil generated by digging the annular ditch, and burying water guide pipes at two ends of the rice field; step two, disinfecting the transformed rice field by using a disinfectant and standing for 14-16 days; step three, planting an aquatic plant, elodea nuttalli, in the annular ditch in the rice field; step four, uniformly putting healthy young blue crabs into the annular ditch in the rice field and regularly feeding the young blue crabs with a feed to realize rice planting and crab culture in the whole field; and step five, planting saline-alkali tolerant rice of a suitable variety in the center of the rice field. The crab and rice breeding method can well combine crab breeding and saline-alkali tolerant rice planting, and ful