The invention discloses a heat treatment method of a high-tenacity high-strength steel plate, which can be used for producing a high-tensile strength high-impact ductility steel plate. The process comprises the following key points: heating the steel plate in a roller hearth type heat treatment furnace, quenching in water or oil to Ms-Mf or BS-Bf, heating to 560-780 DEG C at a rate of 3-50 DEG C/S in an induction heating furnace, preserving the temperature for 5-120 seconds, tempering, and finally cooling to the room temperature in the air. The structures of the obtained steel plate are low-carbon martensites and bainites, a small number of residual austenites and fine carbonitrides dispersedly distributed on martensite or bainite substrates; and the steel plate has high strength and high ductility. Compared with the steel plate produced by the conventional conditioning process, the steel plate produced by the process has higher ductility and lower yield ratio.