Abstract: A cable assembly, a signal transmission structure, and an electronic device are provided. The signal transmission structure includes a circuit board (2), a chip (1), and a cable assembly (3). The chip (1) is assembled on one side of the circuit board (2), and the cable assembly (3) is assembled on the other side of the circuit board (2). The cable assembly (3) includes a cable (31), and the circuit board (2) includes a plurality of conductive holes (22). The chip (1) is electrically connected to the cable (31) of the cable assembly (3) by using the conductive hole (22), to transmit a signal of the chip (1) by using the cable (31). In this technical solution, wires do not need to be disposed in a large area inside the circuit board (2).