The utility model discloses a water permeability reinforced concrete basic unit relates to construction technical field. Its structural strength can only be improved in permeable pavement place to present load is higher through the thickness that increases plain concrete basic unit, the construction limitation is big, has improved engineering cost's problem moreover. It includes plain soil layer,garrulous rock block cushion layer and reinforced concrete layer from bottom to top, reinforcing bar net, the vertical hole of permeating water that sets up a plurality of reinforced concrete of running through layers of reinforced concrete in situ are laid to the reinforced concrete in situ.