The invention discloses a multifunctional intelligent alarm clock sound device, comprising a master control MCU, a power amplifier circuit, a speaker as well as a channel selector switch, a decoder, a crystal oscillation circuit, an instruction receiving module and a display which are connected with the master control MCU; wherein the decoder is provided with an interface used for inputting a digital audio signal, the output terminal of the decoder is connected with the speaker by virtue of the channel selector switch and the power amplifier circuit, and the master control MCU controls the switching of the channel selector switch. The invention not only can realize the alarm clock reminding function of the traditional alarm clock, but also the interface used for inputting a digital audio signal is arranged on the decoder, the interface can receives digital audio signals input by mobile devices such as USB and an SD card, the master control MCU can control the decoder to select a group of input digital audio signals as an alarm clock ring tone, thus the invention can receive digital audio signals on mobile devices, has more alarm clock ring tones which can be updated, is rich in content and has big choice.