A preparation method for a charcoal heat supply body for heating non-combustion-type tobacco products is characterized in that biomass or biomass/metal ions are hydrothermally carbonized to obtain hydrothermal charcoal or hydrothermal charcoal with the metal ions evenly distributed; a developed pore-channel structure is obtained through low-temperature carbonization, the specific area reaches 400-800 m<2>/g, and the ignition temperature of the charcoal material is low (300-450 DEG C). The preparation method has the following advantages that after being hydrothermally carbonized, the biomass contains a great number of oxygen-containing functional groups and still contains 20% of oxygen after being carbonized at low temperature, so that the ignition temperature is low; the metal ions serve as a catalyst in the hydrothermal carbonization process and prompt the biomass to be fast converted into the hydrothermal charcoal at the low temperature, when combusted, the prepared charcoal heat supply body material catalyzes oxidation of CO, micromolecule hydrocarbons and macromolecule aromatic hydrocarbons to reduce harm, to the human body, of the substances; a great number of micro pores are formed through low-temperature carbonization, so that the gas diffusion performance is improved when the prepared charcoal heat supply body material is combusted.