The invention relates to a high-carbon steel high-temperature heating diffusion control method, which comprises the steps of calculating to obtain initial temperature distribution and initial carbon concentration distribution of a billet according to parameter information of the billet; and dynamically calculating current temperature distribution and current carbon concentration distribution of the billet in a high temperature furnace through a computer model according to the initial carbon concentration distribution and the initial temperature distribution, so that the high-temperature heating diffusion end time of high-carbon steel is more accurately confirmed, the product quality is ensured, and the energy consumption is saved. The high-carbon steel high-temperature heating diffusion control method solves the problems that according to existing high-carbon steel high-temperature heating diffusion, the heating time cannot be controlled accurately, and the product quality requirement and the energy conversation cannot be met at the same time.