It means the activity that the diplomatic or consular organ of one country verifies the true of the last signature or seal of the notary or certifying organ on the notary document. The intent to handle the consular certification is to make the notary document issued by one country be admitted by the relative authority of another country, and guarantee that the extraterritorial legal force of the document will not be influenced even if suspecting the authenticity of the signature or seal on the document.