The utility model relates to a can regulate and control farmland ground water level's final stage open drain belongs to farmland drainage technical field, can regulate and control farmland ground water level's final stage open drain include stone masonry groove wall, stone masonry ditch at the bottom of, laid dry stone groove wall, wall groove, kerve, gate. Can regulate and control farmland ground water level's final stage open drain supporting production road construction, stone masonry groove wall leans on the way construction, adopt piece stone grout form stone masonry groove wall and stone masonry ditch at the bottom of, the stability of multiplicable road under the prerequisite of guaranteeing discharge capacity, laid dry stone groove wall leans on the field construction, and laid dry stone groove wall can strengthen farmland soil body permeability, is convenient for get rid of the farmland accumulated water, is the length control of final stage open drain 200 400m, every 20 30m reserves gate slot, sets up the dull and stereotyped steel gate of a simple and easy rectangle in the gate slot, and the high channel water level of harmony can be segmented to the dull and stereotyped steel gate of rectangle, and moisture can be recharged to the farmland by the gap of building by laying bricks or stones between laid dry stone groove wall stone, realizes water resource recycle high efficiency utilization.