The utility model relates to a safety landfill site for sludge immobilization, which comprises a foundation, a seepage-proofing layer and a sludge dumping system, wherein the seepage-proofing layer is arranged between the foundation sludge dumping system; the sludge landfill system comprises dumped sludge, a drainage layer, a leachate collection trough and leachate guide-out equipment; the drainage layer is laid on the seepage-proofing layer; the dumped sludge is placed on the drainage layer; the leachate collection trough is communicated with the drainage layer and is lower than the drainage layer; and the leachate guide-out equipment is communicated with the leachate collection trough. The landfill site has high dehydration efficiency and simple operation; and soil engineering filter bags are piled up, thereby greatly reducing the problem that the occupied area for the natural drying treatment for the sludge is large.