A deposition nozzle and a deposition apparatus include a nozzle body, a precursor passageway formed at a central region of the nozzle body for a precursor gas to be sprayed on the substrate such that the precursor gas reacts with a surface of the substrate, an extraction passageway formed in the nozzle body and located at a peripheral side of the precursor passageway, and extracting residues after the precursor gas reacts with the surface of the substrate, and an air curtain passageway formed in the nozzle body and located at a peripheral side of the extraction passageway for isolating gas to be sprayed on the substrate so as to form a closed gas flow field enclosing a process reaction region between a substrate carrier and the deposition nozzle such that the residues after the precursor gas reacts with the surface of the substrate do not leak.