The invention discloses a normal-temperature modified sludge dehydrating agent. The normal-temperature modified sludge dehydrating agent comprises, by weight, 20-30 parts of calcium oxide, 15-20 partsof ferric chloride, 30-40 parts of modified starch, 15-20 parts of diatomite, 5-10 parts of volcanic rock, 20-30 parts of gelatin, 5-10 parts of polyacrylamide, 1-2 parts of bentonite, 2-3 parts of talcum powder, 2-5 parts of muck and 1-3 parts of chitosan. The normal-temperature modified sludge dehydrating agent obtained in the invention is an organic-inorganic mixture, is powdery, contributes to separation of water and sludge particles in sludge, greatly improves the dehydration performance and compressibility of modified sludge, has sterilization and deodorization effects, can kill most ofmicroorganisms, worm eggs and the like, and reduces the odor concentration of the sludge by 90% or above. The addition amount of the dehydrating agent is 2-5%, the addition amount is small, the costis low, and the modification effect is better than that of a traditional modified dehydrating agent.