The application discloses a method for preparing a nano-quantum dot, a nano-quantum dot material, the application thereof and a quantum dot article, and relates to the technical field of quantum dot material preparation. The method for preparing the nano-quantum dot includes the following steps: rapidly solidifying a high-temperature melt in which a carrier corresponding to a target product ion/atomic group/molecular group is dissolved to obtain a carrier in which the target product nano-quantum dot is embedded. The nano-quantum dot material is prepared by using the method. The nano-quantum dot material is applied to the fields of luminescent devices, optical biological marks, disease detection, semiconductors or photoelectricity. Moreover, a quantum dot article containing the nano-quantum dot material is provided.