The invention discloses a free-cutting high-carbon steel anneal non-oxidation technique. Workpieces are put into an annealing oven for annealing with the control of temperature and heating time, in the annealing process, carbon having a mass ratio of 1:200 with the workpieces is added into the annealing oven, the workpieces are heated under a temperature of 750 DEG C for five hours, and then are heated under a temperature of 694 DEG C for another five hours.According to the invention, decarburization in the anneal course of high-carbon steel can be prevented and quenching hardness can be improved, because carbon having a mass ratio of 1:200 with the workpieces is added into the annealing oven in the annealing process of high-carbon steels, subsequent acid washing process can be omitted, surface quality of the high-carbon steel can be improved and processing cost of the high-carbon steel can be reduced.