The present invention relates to an automatic deceleration system of a forklift, a forklift operation interface including an accelerator pedal, a vehicle control unit connected to the forklift operation interface to control the operation of the forklift according to an operation input of the forklift operation interface, and the vehicle It is connected to the control unit and is configured to include a proportional control valve for transmitting the pressure supplied from the pressure pump under the control of the vehicle control unit to the brake of the forklift, wherein the vehicle control unit is operated by the user while the user operates the accelerator pedal. When it is sensed that the accelerator pedal is returned to the initial position by releasing, it relates to an automatic deceleration system of a forklift, characterized in that the proportional control valve controls to operate the brake with a predetermined braking pressure.
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