Artificial wet land system for sewage treatment

PURPOSE: To provide a constructed wetland system for treating sewage, which is able to solve problems of a subsurface flow treatment wetland such as unnecessary space waste and partial growth of plants by forming a bottom surface of a structure into a step shape or an inclined shape. CONSTITUTION: The system (100) comprises a structure (101) that has a sewage inlet and a treated water outlet (109) and includes a bottom surface (103), the bottom surface formed to have a plurality of steps (103a,103b,103c,103d,103d) that are lowered from an upflow side of the sewage inlet to a downflow side of the treated water outlet, and side walls (105b,105d) that are extended from a peripheral of the bottom surface in an upward direction, a plurality of first partitions (111a,111b,111c,111d,111e) that are extended from an upper surface of each of the stairs in an upward direction, at least one second partition (113a,113b,113c,113d) that is extended from a point, the point spaced apart from the upper surface of the stair between the adjacent first partitions, in an upward direction, potting medium (115) that is laminated at a portion of the upper part of the stairs, respectively and plants (117) that are planted at the potting medium.