The invention discloses a control method for avoiding large-thickness medium-and-high carbon steel cutting delayed cracks in winter. A high carbon steel plate is slowly cooled after normalizing treatment and flame cutting are carried out; in the high carbon steel plate, the content of C ranges from 0.45wt% to 0.47wt%, and the content of Mn ranges from 0.70 wt% to 0.85wt%; and in the normalizing treatment process, the normalizing temperature ranges from 850 DEG C to 880 DEG C, and the heat preservation time ranges from 1.5 min/mm to 2.5 min/mm. According to the method, the design of the high C content and the high Mn content is adopted, so that the martensitic structure is effectively reduced, the stress concentration caused by the heat treatment is reduced, and generation of the delayed cracks is effectively avoided. According to the method, when flame cutting is carried out, temperature waiting cutting is adopted, wind-avoiding cutting is carried out so as to decrease the cooling speed of a cutting face after the steel plate is cut, and the cut steel plate enters a slow cooling pit in time for stress treatment; generation of the martensitic structure is reduced more efficiently, the structure stress concentration is reduced, and the stress delayed cracks caused after flame cutting are avoided; and the outer-plane rate of the delayed cracks of the cutting face is controlled to be within 1%, the production efficiency is effectively improved, and the production cost is reduced.