Distributed water inflow enhanced biological denitrification subsurface flow wetland

The invention discloses a distributed water inflow enhanced biological denitrification subsurface flow wetland, which comprises a water distributing well, a wetland main body, a vermiculite packing layer, a melting furnace slag packing layer, a soil packing layer, a water storage chamber, water distribution pipes and aquatic plants, wherein partition walls are arranged in the wetland main body to divide the wetland into a front section wetland and a back section wetland; 80 percent of inflow water passes through the water storage chamber and enters the front section wetland in a horizontal flow mode, and the other 20 percent of the inflow water enters the back section wetland uniformly through the water distribution pipes in a vertical flow mode to ensure that part of the inflow water directly enters the back part of the wetland, thereby meeting a carbon source requirement of a denitrification zone and improving the total nitrogen removal capacity of the process.