Disclosed are an RF signal of karaoke data receiving pack and karaoke system using thereof. The RF Karaoke data receiving pack includes an RF receiver for receiving a voice signal and key data signal radio-transmitted from a wireless microphone device via a receiving antenna; an audio/key data signal separator for separating the voice signal and key data signal from the signal demodulated by the demodulator, a receiver MCU controlling the internal operation of the RF karaoke data signal receiving pack while transmitting the digital voice signal and key data signal to the external computing device; and an extension pack in which additional songs are recorded, the extension pack being connected to an extension pack slot to transmit data of the additional songs under the control of the receiver MCU.