The invention discloses a two-section type pipe thread sealing structure comprising a pipe connector and a connection object. The pipe connector is provided with an outer thread section and a sealingsection located at the root of the outer thread section. The outer thread section is provided with an outer thread. The plane where the crest of the outer thread is located is cylindrical. The plane where the bottom of the outer thread is located is a retractile cone from the root of the outer thread to the top of the outer thread. The connection object is provided with an inner thread matched with the outer thread section. The sealing section is provided with a sealing conical face. A seal ring is arranged between the end, close to the pipe connector, of the inner thread and the sealing conical face. The two-section type pipe thread sealing structure provided by the invention is reliable in sealing effect and convenient to install and use.