Modularized vertical subsurface flow wetland device capable of adjusting water level and adapting to multiple terrains

The invention provides a water-level-adjustable modularized vertical subsurface flow wetland device suitable for multiple terrains. The water-level-adjustable modularized vertical subsurface flow wetland device comprises a modularized device main body, a water inlet pipeline system and a water outlet pipeline system, the modularized device body comprises a modularized device frame, a covering layer, a water distribution system, a filler layer and a water collecting system, the modularized device body can be quickly assembled on site after factory standardized production, the construction period is shortened, and the product quality can also be guaranteed. The device can be suitable for various terrains, a single module is used as a unit leveling object during construction, the field leveling workload is greatly reduced, and the construction period is shortened. When the wetland is locally blocked, the upper-layer box-packed functional filler of the blocked module unit is lifted out to be washed or replaced, t