To provide a method and a device for controlling an exhaust brake, which can improve fuel efficiency by releasing the operation of the exhaust brake during low-speed traveling.

Relating to a method for controlling an exhaust brake 3, which is configured to enhance an engine brake effect by throttling down a flow passage in the middle of an exhaust pipe 1 when turning a gas pedal off during travelling, an instruction value of a fuel injection amount to an engine is monitored. When turning the gas pedal off during travelling, the exhaust brake 3 is operated under the condition that the instruction value falls below the injection amount of idle rotation, and the operation of the exhaust brake 3 is released when the instruction value becomes equal to or more than the injection amount of idle rotation.