The invention discloses tensile strength 800-MPa-class hot rolling complex phase steel and a production method thereof and belongs to the field of metal material and preparation thereof. The tensile strength 800-MPa-class hot rolling complex phase steel comprises the main components of 0.05%-0.09% of C, 0.10%-0.30% of Si, 1.40%-2.00% of Mn, 0.010%-0.050% of Al, 0-0.020% of P, 0-0.008% of S, 0.010%-0.070% of Nb, 0.08%-0.14% of Ti, 0.10%-0.25% of Mo, and the balance Fe and inevitable impurities. Through treatment of casting blank hot charging, hot continuous rolling and related process steps, yield strength is 700 MPa or above, tensile strength is 800 MPa or above, the hole expansion rate is larger than 60%, the microstructural type is a mixed structure composed of ferrite, granular bainiteand a small amount of island-shaped martensite, after the product is subjected to continuous pickling, product surface quality and performance are excellent, and the product is widely used for manufacturing automobile chassis structural parts, safety belt supports, bumpers and other parts.