High-molecular-weight active comb polymer and preparation method thereof

The invention relates to a high-molecular-weight active comb polymer and a preparation method thereof, which mainly solve the problem of poor connection stability of the active groups of the active polymer and the main chain in prior art. By adopting the technical solution including the active comb polymer represented by structural formula (I) (in which x, y, p and q are mol numbers of structural units of acrylamide, sodium acrylate, 2-acrylamidyl-2-methyl sodium proparesulfonic acid and large monomer with surface activity; x:y:p:q is 60-80:10-30:5-20:0.1-5, R in the large monomer with surface activity is C1-C18 alkyl or C1-C18 alkyl aryl, n is 4-50, and the average molecular weight of the active comb polymer is greater than 106.) and preparation method thereof, the invention solves the problem greatly and can be used in high temperature oil reservoir exploitation with high hypersalinity.