A device for controlling the power of an engine and of a thrust reverser device. The invention includes a frame on which a primary cam track is formed, a thrust lever hinged to the frame, a thrust reverser lever hinged to the thrust lever, a bearing face arranged on the thrust reverser lever, a locking lever hinged to the thrust lever and comprising a first end and a second end. When the thrust lever has been pivoted by a predefined angle relative to the idle position of same, actuation of the thrust reverser lever is blocked, both by the second end of the locking lever pressing against the bearing face of the thrust reverser lever, and by the first end of the locking lever pressing against the primary cam track.