The invention discloses a high-speed LED optical communication bridge-type modulator, and the modulator comprises a power supply unit, an LED, a switch K101, a switch K102, a switch K103, a switch K104, a switch K105, a control unit, a voltage-limiting constant current control unit, and a constant voltage control unit. The switches K101 and K102 are connected, and the switches K103, K104 and K105 are disconnected. The forwarding power supply of the LED is carried out, thereby enabling the LED to be quickly overshot and connected. The switches K103 and K104 are connected, and the switches K101, K102 and K105 are disconnected. The reverse power supply of the LED is carried out, thereby enabling the LED to be quickly turned off. The control of time sequence controls the time of reverse power supply through the monitoring of a reverse current of the LED, and the reverse power supply is not carried out in the whole disconnection process but in a small time period, so as to prevent band bending from causing the great decrease of radiative recombination rate, and improving the disconnection speed of light. The switch K105 is connected, and the switches K101, K102, K103 and K104 are disconnected. The switch K105 is a discharge circuit which aims at speeding up the recombination of residual carriers of the LED, and controls the forwarding unidirectional discharge of the LED. The modulator improves the recombination speed of carriers, and is high in switching speed.