A high-strength steel having excellent brittle crack arrestability, comprising: 0. 05 wt% to 0.1 wt% of carbon (C), 1.5 wt% to 2.2 wt% of manganese (Mn), 0.3 wt% to 1.2 wt% of nickel (Ni), 0.005 wt% to 0.1 wt% of niobium (Nb), 0.005 wt% to 0.1 wt% of titanium (Ti), 0.1 wt% to 0.5 wt% of copper (Cu), 0.1 wt% to 0.3 wt% of silicon (Si), 100 ppm or less of phosphorus (P), 40 ppm or less of sulfur (S), and the remainder being iron (Fe) and other inevitably contained impurities, the high-strength steel having a microstructure including one structure selected from the group consisting of a single-phase structure of ferrite, a single-phase structure of bainite, a complex structure of ferrite and bainite, a complex structure of ferrite and pearlite, and a complex structure of ferrite, bainite and pearlite, and having a thickness of 50 mm or more, wherein the ferrite is acicular ferrite or polygonal ferrite, and the bainite is granular bainite, wherein when the microstructure of the high-strength steel is a complex structure including pearlite, a fraction of pearlite is 20% or less, wherein in the high-strength steel, a grain size of a crystal grain having a high angle boundary, in which a difference in crystal orientations measured in a region from a surface layer portion to a 1/4 thickness point thereof in a thickness direction using an EBSD method is 15 degrees or more, is 15 μm or less, wherein in the high-strength steel, a yield strength thereof is 390 MPa or more, a Charpy fracture-surface transition temperature in a surface layer portion and a 1/4t portion thereof in a thickness direction is -40°C or lower and a Kca value of 6, 000 N/(mm 1.5 ) or more is obtained by performing an ESSO test, and wherein in the high-strength steel, an area ratio of a plane forming an angle of less than 15 degrees with respect to a plane thereof parallel to a rolling direction in a region from a surface layer portion to a 1/4 thickness point of the high-strength steel in a thickness direction is 30% or more. 0. 05 wt% to 0.1 wt% of carbon (C), 1.5 wt% to 2.2 wt% of manganese (Mn), 0.3 wt% to 1.2 wt% of nickel (Ni), 0.005 wt% to 0.1 wt% of niobium (Nb), 0.005 wt% to 0.1 wt% of titanium (Ti), 0.1 wt% to 0.5 wt% of copper (Cu), 0.1 wt% to 0.3 wt% of silicon (Si), 100 ppm or less of phosphorus (P), 40 ppm or less of sulfur (S), and the remainder being iron (Fe) and other inevitably contained impurities, the high-strength steel having a microstructure including one structure selected from the group consisting of a single-phase structure of ferrite, a single-phase structure of bainite, a complex structure of ferrite and bainite, a complex structure of ferrite and pearlite, and a complex structure of ferrite, bainite and pearlite, and having a thickness of 50 mm or more, wherein the ferrite is acicular ferrite or polygonal ferrite, and the bainite is granular bainite, wherein when the microstructure of the high-strength steel is a complex structure including pearlite, a fraction of pearlite is 20% or less, wherein in the high-strength steel, a grain size of a crystal grain having a high angle boundary, in which a difference in crystal orientations measured in a region from a surface layer portion to a 1/4 thickness point thereof in a thickness direction using an EBSD method is 15 degrees or more, is 15 μm or less, wherein in the high-strength steel, a yield strength thereof is 390 MPa or more, a Charpy fracture-surface transition temperature in a surface layer portion and a 1/4t portion thereof in a thickness direction is -40°C or lower and a Kca value of 6, 000 N/(mm 1.5 ) or more is obtained by performing an ESSO test, and wherein in the high-strength steel, an area ratio of a plane forming an angle of less than 15 degrees with respect to a plane thereof parallel to a rolling direction in a region from a surface layer portion to a 1/4 thickness point of the high-strength steel in a thickness direction is 30% or more. <EOS>