The utility model discloses a compound perpendicular tidal flow constructed wetland device, integrated vertical -flow constructed wetland be by two independent wetland interconnect, in middle the wallbody bottom trompil of connecting two wetlands, is equipped with the evacuation pipe in the pond of being issued to the lower level, in going upward the pond, forms a U type structure. Down pond, goupward the cell body and go upward the pond according to water flow direction, rivers to going the pond under calling in the following text, upwards being called, laying the DN75 water distributor ondown pond matrix surface, laying the DN75 collector pipe going upward pond matrix subsurface 8 -12cm, go upward pond and down pond matrix highly uniform, through water distributor and collector pipe difference in height, form surperficial reoxygenation layer, pipeline booster pump links to each other with filter, solenoid valve respectively, and the inlet tube rivers pass through filter, pipelinebooster pump and solenoid valve in proper order. Simple structure, convenient to use has realized constructed wetland wet status switching futilely, has improved its reoxygenation level, under the alternation of wetting and drying condition, can restrain methanogen's metabolic activity, has reduced greenhouse gas emission.