The invention discloses ferritomartensite hot-rolled dual phase steel with high surface quality and a manufacturing method thereof. The steel comprises, by weight percent, 0.04 to 0.08% of C, not larger than 0.1% of Si, 1.0 to 1.4% of Mn, 0.3 to 0.8% of Al, 0.15 to 0.60% of Cr, 0.01 to 0.03% of Nb, not larger than 0.015% of P, not larger than 0.002% of S, and not larger than 0.005% of N, one or more of not larger than 0.03% of Ti, not larger than 0.03% of V, and not larger than 0.005% of Ca and the balance Fe and inevitable impurities. The conditions that the sum of Si+2Al+Cr is larger than orequal to 1.0 and Al/Cr is smaller than or equal to 2.5 need to be met at the same time, according to the hot-rolled dual phase steel, after acid pickling, the surface is bright and clean and free offigures, the tensile strength of the steel can be up to 600 MPa or above, the yield ratio is 0.7 or below, the hole expansion rate is 50% or above, the easy forming high hole expansion property is achieved, the steel can be used for producing parts like car wheel spokes, in addition, a production process is wide in window, industrial large production is easy, and performance is stable.