The invention relates to water absorption resin for well repair and leaking stoppage. The water absorption resin is prepared by the following synthesis steps of: a, mixing 10 to 15 percent of 2-acrylamide-2-methylpropanesulfonic acid, 30 to 45 percent of acrylamide, 0.2 to 0.5 percent of N,N-methylenebisacrylamide and deionized water in a weight ratio with stirring to form a mixture, wherein the stirring time is 5 to 10 minutes and the stirring temperature is 30 to 50 DEG C; b, putting the prepared mixture into a polymerization reaction kettle, stirring the mixture, introducing nitrogen for 30 minutes to displace air in the polymerization reaction kettle, simultaneously heating the polymerization reaction kettle to the temperature of between 40 and 50 DEG C, then adding 0.03 to 0.08 weight percent of persulfate initiator into the mixture, performing polymerization reaction on the mixture to generate the water absorption resin, and preserving heat for at least 6 hours after the polymerization reaction starts; and c, drying the prepared water absorption resin at the temperature of not more than 120 DEG C for 24 hours till complete drying, and crushing the dried water absorption resin into granules with a diameter of 0.5 to 40 millimeters to obtain the water absorption resin for well repair and leaking stoppage.