A100, G50, G53, G54 are four kinds of highstrength steel with high strength, high toughness, good impact resistance and other excellent mechanical properties, which have been widely used in the field of industrial manufacturing. In this paper, the impact toughness and plane strain fracture toughness of four kinds of highstrength steels (A100, G50, G53, G54) were tested, impact energy, fracture toughness and fracture image were also obtained and compared. Results showed that the order of both impact energy and fracture toughness was A100>G50>G54>G53, which indicated that A100 highstrength steel has excellent impact resistance and plane fracture toughness, while G53 and G54 have relatively low impact toughness and plane fracture toughness despite their high static strength. The result could provide a reference for designing and optiming antiimpact structures.