A multi-color illuminated keyboard at least includes a plurality of keys, an array circuit board, a signal processing unit and a lighting control processor. The array circuit board is located beneath the keys and triggered by depressing one key to generate a corresponding array signal or a mode switching signal. The signal processing unit receives the array signal and converts the array signal into a character signal to be output. The signal processing also can receive the mode switching signal and transmit the mode switching signal to the lighting control processor. The lighting control processor presets multiple driving modes and is electrically connected to the lighting element sets in the illuminated keyboard. The lighting control processor can be triggered by the mode switching signal to change the driving modes of the lighting element sets in the illuminated keyboard.