The utility model discloses a farmland benthophyte ecological ditch canal of processing initial stage rainwater, include rainwater by -pass channel and irrigation canals and ditches main part along farmland water flow direction, the farmland, rainwater by -pass channel and irrigation canals and ditches main part are arranged according to high from high to low, and the three is separated by the ridge respectively, the farmland sets up the grid with the intercommunication mouth department of rainwater by -pass channel, be provided with the irrigation canals and ditches water inlet of intercommunication irrigation canals and ditches main part on the rainwater by -pass channel, the end of rainwater by -pass channel sets up the overflow weir, be equipped with the benthophyte area in the irrigation canals and ditches main part, the delivery port department of irrigation canals and ditches main part sets up half permeable dike. The utility model discloses the ecological ditch canal divide into the initial stage rainwater with farmland drainage and the middle and later periods rainwater is dealt with differently, and initial stage rainwater polluting thing concentration is high, utilizes the benthophyte ecological ditch canal to handle, and middle and later periods rainwater polluting thing concentration is low, directly discharges, and it is higher to pollute the place to go pertinence.