A Se-enriched paddy seedling, a cultivating method for the Se-enriched paddy seedling and an organic-selenium-enriched rice are provided. The Se-enriched paddy seedling holds a total selenium of 4.6～360μg per plant when transplanted. The method includes a step that a nano-Se plant nutritional agent is added into a seedling tray raising soil or a seedling raising field during a paddy seedling period and the Se-enriched paddy seedling is then cultivated according to a paddy cultivating method. The Se-enriched rice holes selenium of 100~300μg/kg, in which the organic selenium content is ≥80％. The se-enriched rice is rich in element selenium, and the content is consistent in whole. The method increases the proportion of organic selenium, solves the problem of selenium content consistency of rice growing in different batches in the prior art, ensures selenium content consistency in rice and a standardized mass production can be realized.
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