A connector assembly includes a connector and a fixing plate. The connector includes a block, a connector body formed on a front side of the block, two protrusions at the top and two at the bottom of the block, a limiting member acting as a backplate, and a protruding and deformable latch extending from the block. The fixing plate defines an opening, two notches communicating with the opening, and a positioning hole. When the connector body is pushed through the opening with the two protrusions respectively aligning with and passing through the two notches, the latch is deformed to abut against a rear surface of the fixing plate. The connector may be slid along the opening, to allow the latch to engage in the positioning hole. The protrusions are caught and locked in place by a front surface of the fixing plate.