The invention discloses a preparation method for a constant-temperature material. The preparation method for the constant-temperature material comprises the following steps: weighing stainless steel;taking graphene; preparing a carbon powder; adding rare-earth elements and metals; and obtaining the constant-temperature material through mixing, high-temperature smelting and crystallization. Because the main components of the constant-temperature material are composed of the graphene, the carbon powder, the rare-earth elements and a small amount of common metal elements, compared with a stainless steel kitchenware material, the constant-temperature material does not release heavy metal elements, have no standard-exceeding problem of heavy metals, is more green and environment-friendly, andachieves a higher guarantee on healthy diet; and according to the preparation method for the constant-temperature material, other auxiliary devices do not need to be added, and temperature control canbe realized through the own newest function of the material, and in particular, the preparation method for the constant-temperature material is more prominent in application advantage in the fields of non-stick pans and smokeless pans, also has great advantages in the aspects of material performance, product structure performance, effect popularization, product production cost and the like, and is of great use significance to the field with a requirement on a temperature, for example, the kitchenware industry or the small appliance industry.