The invention provides Q690D low-carbon bainitic steel. The Q690D low-carbon bainitic steel comprises, by weight, 0.06%-0.09% of C, 0.25%-0.35% of Si, 1.55%-1.70% of Mn, 0.35%-0.45% of Cr, 0-0.014% of P, 0-0.010% of S, 0.025%-0.040% of Als, 0.050%-0.060% of Nb, 0.010%-0.025% of Ti, 0.15%-0.25% of Mo and the balance Fe. The total reduction amount of the first rolling stage of the rolling process is 55%-70%, and the temperature-holding thickness is 2.5-4.0 times of the thickness of a steel plate finished product. The finish rolling temperature of the second rolling stage is 800-820 DEG C, and the cumulative reduction rate is larger than or equal to 65% after temperature waiting. The starting cooling temperature of a steel plate in the controlled-cooling process is 760-790 DEG C, the finish cooling temperature is 150-300 DEG C, and the cooling rate is 15-30 DEG C/s. According to the Q690D low-carbon bainitic steel, qualified Q690D steel can be produced at a time, cost is low and the flow path is simple.