A method of preparing a superabsorbent polymer, the method comprising the steps of: a) mixing a water-soluble ethylenically unsaturated monomer, an internal crosslinking agent, and a polymerization initiator to prepare a monomer composition; b) polymerizing the monomer composition to prepare a water-containing gel polymer; c) chopping the water-containing gel polymer; d) adding one or more fibers of a fluff pulp and a synthetic polymeric fiber to the chopped water-containing gel polymer and mixing them with each other to prepare a mixture; e) chopping the mixture; f) drying the mixture; g) pulverizing the mixture; h) adding a surface crosslinking agent to the mixture obtained in the step g); and i) performing a surface crosslinking reaction, wherein the fiber is included in an amount of 5 part by weight to 18 parts by weight with respect to 100 parts by weight of the water-containing gel polymer, wherein the fiber has a length of 1 mm to 20 mm, wherein the mean length of the fibers is obtained by randomly selecting 100 fibers, measuring the lengths of the individual fibers, and calculating the average thereof, wherein the fiber has a width of 1 μm to 100 μm, wherein the mean width of the fibers is obtained by randomly selecting 100 fibers, measuring the widths of the individual fibers, and calculating the average thereof, wherein water is further added in one or more steps of the steps c) to e) in an amount of 1 part by weight to 20 parts by weight with respect to 100 parts by weight of the water-containing gel polymer, wherein the surface crosslinking agent is one or more selected from the group consisting of a polyhydric alcohol compound; an epoxy compound; a polyamine compound; a haloepoxy compound; a condensation product of a haloepoxy compound; an oxazoline compound; a mono-, di-, or polyoxazolidinone compound; a cyclic urea compound; a polyvalent metal salt; and an alkylene carbonate compound, and wherein the surface crosslinking agent is added in an amount of 0.001 part by weight to 5 parts by weight with respect to 100 parts by weight of the mixture. a) mixing a water-soluble ethylenically unsaturated monomer, an internal crosslinking agent, and a polymerization initiator to prepare a monomer composition; b) polymerizing the monomer composition to prepare a water-containing gel polymer; c) chopping the water-containing gel polymer; d) adding one or more fibers of a fluff pulp and a synthetic polymeric fiber to the chopped water-containing gel polymer and mixing them with each other to prepare a mixture; e) chopping the mixture; f) drying the mixture; g) pulverizing the mixture; h) adding a surface crosslinking agent to the mixture obtained in the step g); and i) performing a surface crosslinking reaction, wherein the fiber is included in an amount of 5 part by weight to 18 parts by weight with respect to 100 parts by weight of the water-containing gel polymer, wherein the fiber has a length of 1 mm to 20 mm, wherein the mean length of the fibers is obtained by randomly selecting 100 fibers, measuring the lengths of the individual fibers, and calculating the average thereof, wherein the fiber has a width of 1 μm to 100 μm, wherein the mean width of the fibers is obtained by randomly selecting 100 fibers, measuring the widths of the individual fibers, and calculating the average thereof, wherein water is further added in one or more steps of the steps c) to e) in an amount of 1 part by weight to 20 parts by weight with respect to 100 parts by weight of the water-containing gel polymer, wherein the surface crosslinking agent is one or more selected from the group consisting of a polyhydric alcohol compound; an epoxy compound; a polyamine compound; a haloepoxy compound; a condensation product of a haloepoxy compound; an oxazoline compound; a mono-, di-, or polyoxazolidinone compound; a cyclic urea compound; a polyvalent metal salt; and an alkylene carbonate compound, and wherein the surface crosslinking agent is added in an amount of 0.001 part by weight to 5 parts by weight with respect to 100 parts by weight of the mixture.