An environment-friendly self-crosslinkable polymer gel was prepared utilizing acrylamide (AM) and double acetone acrylamide (DAAM) oxazine sulfate. The optimum syntheses condition was obtained as follows: 5% AM, 0.8% DAAM oxazine sulfate, 0.8% initiator, 8 pH value and 50℃ reaction temperature. The viscosity of solution before gelling was about 15 mPa·s which indicated good injection. The gelation time could be controlled by 1—3 days. Meanwhile, the high gel strength (I grade) of binary crosslinkable copolymer kept 1 days at 60℃. Core plugging experiment results showed that the blocking rate of water was between 93.50% and 99.71%, and breakthrough pressure gradient was in a range of 31.25—58.61 MPa/m.