The utility model discloses a farmland benthophyte ecological ditch canal utilizes the current irrigation canals and ditches transformation in farmland to form, half permeable dike of locating at the delivery port of irrigation canals and ditches main part is taken and set up including irrigation canals and ditches main part, setting at the grid of the water inlet department of irrigation canals and ditches main part, the benthophyte who sets up in the irrigation canals and ditches main part. The utility model discloses the ecological ditch canal utilizes benthophyte to have the ecological purification performance to farmland low concentration face source sewage, can effectively reduce suspended solid, nitrogen, phosphorus content, and the current farmland irrigation canals and ditches space of make full use of, has practiced thrift land resource.