A duplex male electrical connector includes an insulating base, two rows of first connection contacts and a socket shell. The insulating base has a front section formed with a connection board. The connection board has opposite top and bottom surfaces. The two rows of first connection contacts are disposed on the top and bottom surfaces of the connection board, respectively. The socket shell is formed with a connection slot having a front end serving as an insert port. The connection board is disposed in the connection slot. The socket shell and the connection board can vertically float and move relative to each other, such that the connection board can vertically float and move relative to the socket shell or the socket shell can vertically float and move relative to the connection board.