This paper reviewed organic polymer sludge dewatering flocculant which was researched and used extensively. Organic polymer sludge dewatering flocculant can be divided into polymeric and natural modified according to synthesis method. Polymeric flocculant can be divided into cationic, anionic, nonionic and amphoteric. Natural modified flocculant can be divided into carbohydrates and Chitosan. Meanwhile, the paper elaborated and generalized the flocculation mechanism of organic polymer sludge dewatering flocculant. Also, the paper discoursed the advantages, disadvantages and application Status of these six flocculants. Finally, the prospects of sludge dewatering polymer flocculant were prospected.