The invention provides a connector assembly. The connector assembly comprises a connector and a flexible circuit board, wherein the connector is used for being mounted on a functional circuit board and is electrically connected with the functional circuit board, the flexible circuit board comprises a first flexible circuit board and a second flexible circuit board, the first flexible circuit board and the second flexible circuit board are fixed through a buckle and are electrically connected with each other, the connector is further electrically connected with the first flexible circuit board, and the second flexible circuit board is used for being electrically connected with a functional device. The invention further provides a power supply assembly and a mobile terminal. In the invention, the flexible circuit board is formed by fixing the first flexible circuit board and the second flexible circuit board through the buckle, and the first flexible circuit board and the second flexible circuit board are separated or connected conveniently, thereby facilitating maintenance and detection of the functional device and/or the connector.