The invention provides a 6-8mm high-strength structural steel plate and a manufacture method thereof, aiming at meeting the market requirement for the technology of utilizing thinner steel plates for a concrete pump truck, an aerial ladder and a special vehicle for high-level rescue, and overcoming the shortcomings in the aspect ofdue to the strength, service life and the likeothers of low-level steel. The manufacture method is characterized in that low carbon and manganese contents are is designed; 0.0012% of boron and 0.08% of molybdenum element are added; a converter is utilized for realizing quick smelting; the external refining and degassing refining are performed to improve the purity of molten steel; and rolling, quenching and tempering technologies are carried out to improve the strength and toughness of the steel as well as improve the straightness of the steel plate, in order to obtain a tempered sorbite metallographic structure. The method is short in process, high in efficiency, easy to operate and weld, and low in cost; and the shape and straightness of the plate are controlled to meet the requirements on manufacturing and using of modern pump trucks, high-level aerial ladders, rescue work facilities and other telescopic arm structures.