The invention relates to an 800MPa level hot-rolling high broaching steel plate and a manufacturing method thereof. The high broaching steel plate is manufactured from the following chemical compositions in percentage by mass: 0.05-0.10% of C, 0.2-1.0% of Si, 1.0-1.8% of Mn, 0.02-0.08% of Als, 0.03-0.08% of Nb, 0.01-0.05% of Ti, P which is less than 0.008%, S which is less than 0.004%, and the balance being Fe and impurities. The final texture of the steel plate consists of ferrite and bainite. The heating temperature of plate blanks is 1200-1240 DEG C, and the heat insulation treatment is performed for 1-3 hours; two-stage control rolling is adopted, the rolling temperature of a recrystallization zone is higher than 1050 DEG C, the finishing rolling temperature of a non-recrystallization zone is 840-920DEG C, and the thickness of a finished product is 2.0-6.0mm; the cooling rate of rolled continuous laminar flows is 20-40 DEG C/s, and the coiling temperature is 420-550 DEG C. The high broaching steel plate disclosed by the invention is simple in technology, uniform in performance, low in content of alloys, and low in cost; the mechanical property of the steel plate is favorable, and the steel plate has favorable strength and a matched hole expansion rate, the tensile strength is greater than 800MPa, the yield strength is greater than 600MPa, the elongation is greater than 18%, the hole expansion rate is greater than 70%, and the steel plate is especially suitable for being used for manufacturing automobile parts with complex shapes.