The invention belongs to the technical field of environmental engineering sewage treatment, in particular to a strengthened land domestic sewage treatment system with a built-in filter cloth trench, comprising a surface layer, a percolation layer and a gravel water-collecting layer from top to bottom. The percolation layer comprises a local soil and fine sand layer and a fine sand layer; the bottom of the gravel water-collecting layer is provided with an exhalent pipe; the local soil and fine sand layer is internally provided with a water-distribution percolation tank; one side of the water-distribution percolation tank is provided with an intake pipe; the water-distribution percolation tank is internally provided with a water-distribution pipe; a gap between the water-distribution percolation tank and the water-distribution pipe is filled with biological porcelain granules; the water-distribution pipe is internally provided with a filter cloth pipe; the top of the water-distribution percolation tank is covered with non-woven fabrics; and double layers of opening standpipes are inserted from top to bottom, sequentially penetrate through the surface layer, the percolation layer andthe gravel water-collecting layer and comprise an inner layer of drainpipes and an outer layer of drainpipes. The system reduces pollutants entering a land treatment system, such as suspended substances, organic substances, and the like so as to relieve a soil blockage phenomenon, improve the hydraulic load and prolong the serviceable life of land sewage treatment. In addition, the double openingstandpipes are arranged to enhance oxygen supply and can be used for monitoring the operation state of the system.