Novel subsurface flow constructed wetland

The utility model discloses a novel subsurface flow constructed wetland which comprises a pool body, a substrate layer, a water inlet pipeline and a water outlet pipeline, and the substrate layer comprises a base layer, a generation layer, a barrier layer and a growth layer from bottom to top; wherein the particle size needs to meet the requirement that the base layer > the generation layer > thebarrier layer > the growth layer, and the substrate layer mainly comprises the generation layer. Water inlet transverse pipes with different heights are arranged, so that the risk of water inlet blockage is reduced; the light shielding layer can effectively avoid direct sunlight, reduce heat generated by light absorption and has little influence on the nitrogen removal performance of microorganisms; the fixing frame can protect the pool body, so that the pool body is firmer; matrix arrangement of different particle sizes is beneficial to growth of microorganisms and adsorption and precipitation of suspended solids; th