NOVELTY - Organic domestic wastewater pre-treating system comprises sludge tank (1), primary sedimentation tank (2), soft filler tank (3), hard filler tank (4), and collecting tank (5) connected in series; and top inspection hole (7) and horizontal flow sedimentation tank in primary sedimentation tank, water inlet close to bottom end provided with bucket, sludge pump, primary sedimentation tank sludge into sludge tank, and primary sludge tank comprising top wall through hole.    USE - Organic domestic wastewater pre-treating system.    DETAILED DESCRIPTION - Organic domestic wastewater pre-treating system comprises sludge tank (1), primary sedimentation tank (2), soft filler tank (3), hard filler tank (4), and collecting tank (5) connected in series; top inspection hole (7) and horizontal flow sedimentation tank in primary sedimentation tank, water inlet close to bottom end provided with bucket, sludge pump, primary sedimentation tank sludge into sludge tank, and primary sludge tank comprising top wall through hole, sludge tank at upper layer clear liquid flowing into sedimentation tank from through hole, sludge tank middle section provided with sludge hopper, sludge pump, redundant sludge discharging marsh gas tank in fermentation or treatment; filling material tank with large specific surface area of microorganism attachment, to prevent blocking, hard filler tank provided with number of 1-5, hard filling tank with hard filler of alkaline hard filler comprising slag, porcelain, cordierite and limestone, hard surface attached with microorganism, soft filling material tank and sewage operation route of hard filler tank with cell bottom upwards pushing forwards, primary sedimentation tank with upper clear liquid discharged in soft filler tank and hard filler tank; and collecting tank, soft filler and hard filler tank provided with water tank (8), soft filling material tank and hard filler tank through water distribution tank for water distribution.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of the organic domestic wastewater pre-treating system.    Sludge tank (1)    Primary sedimentation tank (2)    Soft filler tank (3)    Hard filler tank (4)    Collecting tank (5)    Top inspection hole (7)    Water tank (8)