The utility model discloses an arable layer of three -dimensional drainage composite construction. This arable layer replies the layer by the surface soil and the composite bed constitutes, the surface soil is replied the layer and is set up the upper surface at the composite bed, and composite bed top -down is soil moved in to improve the original layer, filter layer, permeable bed in proper order, the surface soil is replied the layer and is former topsoil, and the soil moved in to improve the original layer is the soil outside the former arable layer, and the filter layer is the straw, and the permeable bed is the coarse sand. The utility model discloses mainly from improving the field husbandry layer structure, improve the technical problem of the long -term accumulated water in farmland. Wherein the original suitable living environment that the growth of crop root system has been ensured on the layer is replied to the surface soil. Low -lying, the influence of orographic factor to the farmland accumulated water such as sink has been eliminated to a certain extent on the soil moved in to improve the original layer. The filter layer adopts the straw, and the direct contact that has avoided the surface soil to reply soil and permeable bed coarse sand in the layer has prevented the jam. The permeable bed adopts the coarse sand, makes whole arable layer form the passageway of easy infiltration, has solved effectively that moisture is indulged, transverse drainage, has improved the agricultural drain coefficient.