The invention discloses a rice-loach-fish coupling interplanting and crop rotation method, belonging to the technical field of culture condition improved water culture methods. The method comprises the following steps of: planting early indica rice, and transplanting; breeding loaches in a suitable place; harvesting the early indica rice; putting fish fries into the farmland; and capturing fishes and the loaches. The rice-loach-fish coupling interplanting and crop rotation method provided by the invention can be applied to the planting of rice and early rice and has the advantages of high yield, high quality, high benefit and the like.