The invention discloses a monoclonal antibody against a RBD region of novel coronavirus SARS-CoV-2 spike protein and application of the monoclonal antibody. The monoclonal antibody specifically bindsto the RBD region of the novel coronavirus SARS-CoV-2 spike glycoprotein. The monoclonal antibody comprises complementarity determining regions of CDRH1, CDRH2, CDRH3 of a heavy chain variable regionand complementarity determining regions of CDRL1, CDRL2, CDRL3 of a light chain variable region. According to the monoclonal antibody against the RBD region of the novel coronavirus SARS-CoV-2 spike protein, the titer is high, the specificity is higher, efficient expressing can be achieved, the monoclonal antibody can specifically bind to the RBD region of the spike protein on the surface of the novel coronavirus SARS-CoV-2 and can be used for the detection of the ovel coronavirus SARS-CoV-2, certain toxicity of the novel coronavirus can be neutralized and reduced, and the effect of preventingor / and treating the novel coronavirus pneumonia is achieved.