Polyacrylamide suitable for oil extraction with extremely high salinity and preparation method thereof

The invention relates to the technical field of oil extraction, and particularly discloses polyacrylamide suitable for oil extraction with extremely high salinity and a preparation method of the polyacrylamide. The polyacrylamide applicable to the oil extraction with extremely high mineralization degree is prepared from the following raw materials in parts by weight: 20 to 25 parts of acrylamide, 10 to 18 parts of functional mixed monomer, 4 to 6 parts of konjac glucomannan, 0.05 to 0.15 part of complexing agent, 0.01 to 0.05 part of initiator, 0.008 to 0.02 part of chain transfer agent, 0.5 to 5 parts of cosolvent and 0.006 to 0.012 part of ceric ammonium nitrate, the formula is simple, the proportion is rigorous, and the obtained polyacrylamide has excellent salt resistance and high temperature resistance; the acrylamide, the functional mixed monomer, the cosolvent, the complexing agent, the initiator and the chain transfer agent are mixed for reaction, then konjac glucomannan and ceric ammonium nitrate are