Provided in the present application is a farmland irrigation and drainage system. The farmland irrigation and drainage system comprises: a water inlet pool, the water inlet pool being provided in a piece of farmland, and the water inlet pool being made with a water-filtering material; and, a water outlet pool, the water outlet pool being provided at an interval to the water inlet pool in the farmland, a water overflow being provided on the sidewall of the water outlet pool, the water outlet pool being in communication with the farmland via the water overflow, and a predetermined water level of the farmland being controlled by controlling the height of the water overflow. The technical solution of the present application solves the problem that automatic irrigation and drainage could not be implemented by a farmland irrigation and drainage system in the prior art.
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