The invention discloses a high-universality digital car audio system. The high-universality digital car audio system takes an STC12C5624AD single chip microcomputer as a main control chip, controls a power supply module, a radio module, an audio decoding module, a power amplifier processing module, a sound effect processing module, a key control module and a liquid crystal display module to work through an I2C bus, and achieves the digital stereo radio reception, the music playback with multiple sound effects, and the playback of external storage devices. Drivers can read out the working conditions of the audio system from an LCD screen, and can also achieve the switch between an audio player and the radio through the key module to change the sound effect and adjust the sound volume. The high-universality digital car audio system disclosed by the invention adopts a sub-module design, can achieve the increase or decrease of each functional module based on the requirements of customers, has good radio receiving performance and play performance, is low in power consumption, is suitable for various working conditions, and has strong universality.