Underground water advection percolation system used for town sewage treatment

The invention relates to an underground water advection percolation system used for town sewage treatment, concretely comprising a water distribution region, a filler bed, water distribution baffles, aerator pipes, a water collecting region, impermeable layers, geotechnical cloth interlayers, a surface planting soil layer and plants. The whole of the system provided by the invention is of a strip-shaped groove bed body structure, the water distribution region and the water collecting region are respectively arranged at the two ends of the filler bed body, the water distribution baffles divide the filler bed into a plurality of compartment units, aerator pipes are arranged at the lower part of filler in each odd number compartment, aeration rate can be regulated, the impermeable layers are arranged at the bottom of the filler bed and the periphery of the filler bed, a plurality of geotechnical cloth interlayers are paved at the upper part of the filler bed, the surface planting soil layer is arranged at the up