Composite polyacrylamide for water treatment

The invention discloses composite polyacrylamide for water treatment. The composite polyacrylamide comprises polyacrylamide, a water-soluble surface active agent, an inorganic flocculant and water-soluble inorganic salt, wherein the molecular weight of the polyacrylamide is (1-1.5)*10 -10 ; by taking the weight of the polyacrylamide as a reference, the effective components of the water-soluble surface active agent account for 1%-10% of the weight of the polyacrylamide, the effective components of the inorganic flocculant account for 1%-20% of the weight of the polyacrylamide, and the water-soluble inorganic salt accounts for 6%-90% of the weight of the polyacrylamide. The composite polyacrylamide disclosed by the invention can be reduced in cost under the precondition of ensuring the water treatment quality.