The application discloses a nano
drug based on
nitrogen-doped selenized carbon dots and a preparation method and application thereof, and belongs to the technical field of biological medicines, wherein the preparation method of the nano
drug comprises the following steps: placing an
amino acid compound and a
small molecule drug in a
solvent to mix, adjusting the pH value to be alkaline, then performing a heating reaction to obtain a reaction solution; the
amino acid compound is one or more of L-selenocystine, L-
selenocysteine and L-selenomethionine; the
small molecule drug is
metformin hydrochloride or
phenformin; and the nano drug is obtained by separating and purifying from the reaction solution. The nano drug can significantly relieve
cell oxidative damage induced by
hydrogen peroxide, can effectively remove ROS excessively accumulated in a damage site, and can inhibit the progress of secondary damage. In addition, the nano drug can regulate four key
signal paths of antioxidation, anti-
inflammation, anti-
apoptosis and
axon regeneration and myelination, and can synergistically promote the
nerve repair process after
spinal cord injury.