A method of manufacturing luminescent nanocarbon from a raw material aqueous solution containing organic acid or sugar as a carbon source compound and aliphatic amine as a nitrogen source compound, the method comprising: a reaction step of heating the raw material aqueous solution in a reaction container to react the raw material aqueous solution at a reaction temperature of 150°C or higher and 300°C or lower; and a cooling step of cooling a reaction solution containing a reaction product generated from the raw material aqueous solution in the reaction step, wherein the reaction step is carried out through a batch-type reaction or a continuous-type reaction; when the reaction step is carried out through the batch-type reaction, the raw material aqueous solution is charged in such an amount that the raw material aqueous solution in the reaction container has a higher density than that in the vapor-liquid equilibrium state by carrying out the reaction step under a condition in which the reaction temperature is 200°C or higher and 250°C or lower, and the raw material aqueous solution is charged in an amount that occupies about 90% or more of the volume of the reaction container; when the reaction step is carried out through the continuous-type reaction, the pressure in the reaction container is regulated so that the pressure of the raw material aqueous solution becomes higher than the saturated vapor pressure at which the vapor-liquid equilibrium is established. a reaction step of heating the raw material aqueous solution in a reaction container to react the raw material aqueous solution at a reaction temperature of 150°C or higher and 300°C or lower; and a cooling step of cooling a reaction solution containing a reaction product generated from the raw material aqueous solution in the reaction step, wherein the reaction step is carried out through a batch-type reaction or a continuous-type reaction; when the reaction step is carried out through the batch-type reaction, the raw material aqueous solution is charged in such an amount that the raw material aqueous solution in the reaction container has a higher density than that in the vapor-liquid equilibrium state by carrying out the reaction step under a condition in which the reaction temperature is 200°C or higher and 250°C or lower, and the raw material aqueous solution is charged in an amount that occupies about 90% or more of the volume of the reaction container; when the reaction step is carried out through the continuous-type reaction, the pressure in the reaction container is regulated so that the pressure of the raw material aqueous solution becomes higher than the saturated vapor pressure at which the vapor-liquid equilibrium is established. when the reaction step is carried out through the batch-type reaction, the raw material aqueous solution is charged in such an amount that the raw material aqueous solution in the reaction container has a higher density than that in the vapor-liquid equilibrium state by carrying out the reaction step under a condition in which the reaction temperature is 200°C or higher and 250°C or lower, and the raw material aqueous solution is charged in an amount that occupies about 90% or more of the volume of the reaction container; when the reaction step is carried out through the continuous-type reaction, the pressure in the reaction container is regulated so that the pressure of the raw material aqueous solution becomes higher than the saturated vapor pressure at which the vapor-liquid equilibrium is established. <EOS>