The invention discloses a method for efficiently removing heavy metal pollution in farmland irrigation water by utilizing a plant pond and an adsorption pool. The method comprises the following key steps: forming the plant pond and the adsorption pool by selecting a farmland in which the difference of elevation can be utilized to realize natural water inflow and outflow according to the distributional situation of irrigation ditches in the farmland, planting aquatic plants such as cattail, hydrilla and the like in the plant pond, which are resistant to heavy metals and have strong heavy metal absorption capacity, and filling the adsorption pool with industrial and agricultural waste such as straw and the like, which have strong heavy metal absorption capacity so as to cleanse the heavy metal pollution in the farmland irrigation water. The aquatic plant not only can prevent short pass of water flow but also can improve cleansing efficiency; the adsorption pool can further improve the cleansing efficiency to guarantee that the heavy metal content in the farmland irrigation water reaches a set standard. The method not only can be used for efficiently removing the heavy metal pollution in the irrigation water, but also can be used for cleansing pollution caused by nitrogen, phosphorus and the like, and can further guarantee that the heavy metal content in the farmland irrigation water all reaches the set standard all year round.