The invention discloses an intelligent vehicle-mounted sound system with a built-in digital audio signal processing (DSP) module. The system comprises a vehicle-mounted sound host, an access cloud mechanism, a cloud DSP setting transaction server, an external power amplifier, a first speaker group, a second speaker group, an upper computer and a mobile phone. The vehicle-mounted sound host comprises a communication module, an operating system and audio decoding module, an interface module, a pre-power amplifier module, an external power amplifier connection interface, a DSP module, a radio module, an audio signal source interface, a Bluetooth module, an HMI module, an upper computer and mobile phone interface and an audio file library. The DSP module selects an input sound source and performs digital audio signal processing on the sound source, and comprises a multi-channel analog sound source input interface, a digital sound source input interface, a command and data interface, an analogue-to-digital conversion unit, a core audio signal processing unit, a digital-to-analog conversion unit, a sound effect and sound field setting storage unit, and a multi-channel analog audio signal output interface.