A wireless digital music playing and transmitting device installed on the portable DVD/CD player wherein a transmitter having a functional interface consists of a central processing and audio frequency AD converting circuit, a radio-frequency module, an indicating lamp and a power control circuit; output terminals of the central processing and audio frequency AD converting circuit are connected to the radio frequency module, the indicating lamp and the power control circuit; a receiver consists of at least one set of switching circuits, a radio-frequency receiving module, a central processing and AD converting circuit and an audio-frequency amplifier circuit; output terminals of said radio-frequency receiving module are connected to the central processing and AD converting circuit, output terminals of the central processing and AD converting circuit are connected to the audio-frequency amplifier circuit which is provided with a functional interface.