Gel profile control and water shutoff agent and preparation method thereof

The invention discloses a gel profile control and water shutoff agent. The gel profile control and water shutoff agent is prepared from the following components in percentage by mass: 0.2%-0.6% of polyacrylamide, 0.2%-0.4% of sodium dichromate, 0.1%-0.3% of reducing agent, 0.1%-0.3% of delayed crosslinker, 0.1%-0.3% of organic phosphonate tackifier and the balance of water. The preparation methodcomprises the steps that the polyacrylamide is dissolved into the water; the sodium dichromate, the reducing agent, the delayed crosslinker and the organic phosphonate tackifier are dissolved into thewater; and two solutions are mixed evenly, sealed and aged for 30 hours or above at 60-90 DEG C, and thus the gel profile control and water shutoff agent is obtained. The gel profile control and water shutoff agent is temperature-resistant and salt-resistant capability, the stability of gel can be effectively improved, the applicable reservoir temperature range is wide, the mineralization degreeinterval of formation water