Disclosed are methods for manufacturing perovskite nanocrystals and a perovskite light-emitting device, and perovskite nanocrystals and a perovskite light-emitting device which are manufactured by using same. The present invention provides: a method for manufacturing a perovskite light-emitting device; and a perovskite light-emitting device manufactured by using same, the perovskite light-emitting device comprising a perovskite photoactive layer that includes perovskite nanocrystals manufactured by selectively doping a second halogen ion onto the surface of a perovskite compound by utilizing a ligand exchange process using halogenated surface ligands.
