The present disclosure discloses a socket connector including an insulating base and a number of socket terminals. The insulating base includes an outer plastic frame defining a receiving channel and an inner plastic block received in the receiving channel. The inner plastic block includes two sidewalls opposite to each other in a left-and-right direction. The socket terminals are arranged in two rows by positioning symmetrically and respectively on the two sidewalls of the inner plastic block. The socket terminals of each row are arranged in an upper-and-lower direction and spaced away from each other in the upper-and-lower direction. Each socket terminal extends along a front-and-back direction perpendicular to both the left-and-right direction and the upper-and-lower direction. A connector assembly including the socket connector and the mated plug connector is also disclosed in the present disclosure.