Farmland drainage device

The utility model discloses a farmland drainage device, and relates to the technical field of farmland management. Comprising a plurality of drainage branch pipes and a drainage main pipe. The drainage branch pipes are connected with the drainage main pipe through electromagnetic valves; a water outlet of the main drainage pipe is positioned above the reservoir; the drainage branch pipe penetrates through the ridge and is arranged in the farmland; a liquid level switch used for controlling the electromagnetic valve to be opened or closed is arranged above a water inlet of the drainage branch pipe, the water inlet of the drainage branch pipe is provided with an inclined face inclining downwards, and a filter screen used for filtering soil is arranged on the inclined face. The electromagnetic valve is controlled to be opened or closed through the liquid level switch so as to realize automatic drainage; soil loss is reduced through the arrangement of a filter screen, and soil backfilling is facilitated through t