The invention discloses a visible light communication LED light source with an adjustable modulation bandwidth. The visible light communication LED light source with the adjustable modulation bandwidth comprises an LED device for visible light communication, a blocking capacitor and an adjustable resistor; the blocking capacitor is connected to the adjustable resistor in series; the blocking capacitor is connected to the adjustable resistor and the LED device in parallel; the anode of the LED device and one end of the blocking capacitor are input terminals; and the cathode of the LED device and one end of the adjustable resistor are output terminals. The visible light communication LED light source with the adjustable modulation bandwidth is applicable to LED devices of different bandwidths and different impedance characteristics, and can improve communication quality of the visible light communication light source in an extreme environment.