Provided are a socket connector and a plug connector. The socket connector comprises a terminal module group and a shielding housing. One of the side walls of the shielding housing is provided with a protruding anti-plugging portion extending towards an abutted-joint chamber. The protruding anti-plugging portion allows insertion of a matched plug connector with an anti-plugging matching portion and prevents insertion of a plug connector without an anti-plugging matching portion. The plug connector comprises an insulation body, two rows of terminals, a locking member and the shielding housing cladding the insulation body. One of the side walls of the shielding housing is provided with an anti-plugging matching portion in a slit structure. Accordingly, a good effect of preventing abutted joint with an unmatched connector is realized.