The invention relates to a low-resistance anti-blockage vertical flow 
wetland structure. A rectangular pressure-bearing 
pool (20 to 30 meters deep and unlimited in length and depth) is parallelly divided into a water distribution 
ditch, a filling basin and a water collecting 
ditch by two separating 
pool ridges, wherein the separating 
pool ridge between the filling basin and the water collecting 
ditch is 300 millimeters lower than the other poll 
ridge and is uniformly distributed with 'V'-shaped weirs on the top, and the water distribution ditch and the water collecting ditch are communicated with adjacent process units through a water inlet and a water outlet; water distribution pipes are parallelly arranged at the bottom of the filling basin at 500 
millimeter intervals on a plane at a height of 30 millimeters, the water inlet ends of the water distribution pipes pass through one separating pool 
ridge to be exposed in the water distribution ditch, the other ends of the water distribution pipes pass through the other separating pool ridge to be exposed in the water collecting ditch and are blocked by plugs with threaded-openings, and the water distribution pipes are provided with dense water outlet holes and are protected by a dry 
brickwork outer shell; a filling is filled in the filling basin to a level 100 to 150 millimeters lower than the 'V'-shaped wires, water is filled into the filling basin, plants are planted in the filling basin and the filling basin is put into operation; and 
water flow from the prior process unit first enters the water distribution ditch through the water inlet, then enters the water distribution pipes from the water distribution ditch, later on overcomes the resistance of the water outlet holes on the water distribution pipes to enter a filling layer, rises slowly at a constant and 
low speed from the filling layer to a 
free water layer above the filling layer, overflows from the 'V'-shaped wires and falls into the 
water collection ditch.