The invention discloses a single-steel multi-stage hot-rolled complex-phase high-strength steel plate and a production method thereof. The production method comprises the steps of heating, hot rolling, cooling, coiling, annealing and acid pickling. The steel plate comprises, by weight percentage, 0.08-0.15% of C, 1.80-3.00% of Mn, less than or equal to 0.015% of S, less than or equal to 0.025% of P, 0.50-1.00% of Si, 0.020-0.060% of Als, 0.40-1.0% of Cr, 0.010-0.040% of Ti, 0.10-0.30% of Mo, less than or equal to 0.007% of N, and the balance Fe and inevitable impurities. According to the production method, a composition system is adopted through a reasonable composition design, complex-phase steel with different strength levels is produced by controlling different structure types in the hot rolling and annealing processes, and therefore the special requirement that a steel enterprise can meet the different performance of users by adopting one composition system can be met, the mechanical property of the whole-coil product is uniform, the baking hardening performance is good, and the requirements of the users for small-batch and different-strength-level samples can be met.