A circuit board assembly is provided. The circuit board assembly includes: a first circuit board; a second circuit board; a bracket for supporting the second circuit board; and an interconnect apparatus for a connection and a disconnection of the first circuit board and the second circuit board, wherein the interconnect apparatus includes a first connector disposed on the first circuit board and a second connector disposed on the second circuit board (one is a male connector and the other is a female connector). The circuit board assembly includes a lifting and lowering apparatus for vertically lifting or lowering the bracket so that after the connection the second connector is vertically disconnected from the first connector and after the disconnection the second connector is vertically connected to the first connector. An electronic device having the circuit board assembly is further provided.