A fully-shielded high-frequency connector, configured to be in mating connection with a docking connector which comprises a metal casing, and comprising: an insulating base, a shell, and a signal terminal and a shielding conductive stiffener which are disposed on the insulating base, wherein the insulating base comprises an insulating body, a fitting portion and a gland portion which are connected to the insulating body, a first through hole structure located between the insulating body and the fitting portion, and a second through hole structure located on the fitting portion; the signal terminal is disposed between the fitting portion and the gland portion and comprises a contact portion, a connection portion and a mounting portion which are disposed in sequence, wherein the contact portion is exposed in the second through hole structure and is configured to be in contact with the docking connector to achieve electrical connection, and the mounting portion is configured to be electrically connected to an inner conductor of a coaxial cable; the shielding conductive stiffener is disposed between the insulating body and the fitting portion and comprises a tube structure, a fixing connection structure and a cover plate structure which are disposed in sequence, wherein the tube structure is disposed in the first through hole structure and wraps an outside of the fitting portion, the fixing connection structure is configured to fix the shielding conductive stiffener on the insulating base, and the cover plate structure covers an upper side surface of the insulating body and is connected to the shell; and the shell comprises a main body portion, a bonding portion, a fixing portion and a snap portion, wherein the fixing portion is configured to cover and be in electrical contact with the cover plate structure and an outside of an outer conductor of the coaxial cable; the snap portion is located on an upper side of the fixing portion after being snapped and the snap portion is configured to reinforce connection stability between the fixing portion, the cover plate structure and the coaxial cable; and the bonding portion and the snap portion are configured to cooperate to assemble and fix the insulating base on which the signal terminal and the shielding conductive stiffener are assembled and the shell together to enable the shell and the tube structure of the shielding conductive stiffener to be in close electrical contact with the metal casing of the docking connector when the metal casing of the docking connector is located between the shell and the tube structure of the shielding conductive stiffener, so that electromagnetic signal leakage is prevented. the insulating base comprises an insulating body, a fitting portion and a gland portion which are connected to the insulating body, a first through hole structure located between the insulating body and the fitting portion, and a second through hole structure located on the fitting portion; the signal terminal is disposed between the fitting portion and the gland portion and comprises a contact portion, a connection portion and a mounting portion which are disposed in sequence, wherein the contact portion is exposed in the second through hole structure and is configured to be in contact with the docking connector to achieve electrical connection, and the mounting portion is configured to be electrically connected to an inner conductor of a coaxial cable; the shielding conductive stiffener is disposed between the insulating body and the fitting portion and comprises a tube structure, a fixing connection structure and a cover plate structure which are disposed in sequence, wherein the tube structure is disposed in the first through hole structure and wraps an outside of the fitting portion, the fixing connection structure is configured to fix the shielding conductive stiffener on the insulating base, and the cover plate structure covers an upper side surface of the insulating body and is connected to the shell; and the shell comprises a main body portion, a bonding portion, a fixing portion and a snap portion, wherein the fixing portion is configured to cover and be in electrical contact with the cover plate structure and an outside of an outer conductor of the coaxial cable; the snap portion is located on an upper side of the fixing portion after being snapped and the snap portion is configured to reinforce connection stability between the fixing portion, the cover plate structure and the coaxial cable; and the bonding portion and the snap portion are configured to cooperate to assemble and fix the insulating base on which the signal terminal and the shielding conductive stiffener are assembled and the shell together to enable the shell and the tube structure of the shielding conductive stiffener to be in close electrical contact with the metal casing of the docking connector when the metal casing of the docking connector is located between the shell and the tube structure of the shielding conductive stiffener, so that electromagnetic signal leakage is prevented.