The invention relates to a damping structure of an instrument panel air outlet single-layer blade. The structure involves the single-layer blade, and the single-layer blade is arranged at an air outlet through a left support and a right support; and the structure is characterized in that the rear part of the left end of the right support or the rear part of the right end of the left support is provided with an elastic protruding structure arranged in an up and down direction, correspondingly, a cantilever extends to the right from the rear part of the right end of the single-layer blade, or acantilever extends to the left from the rear part of the left end of the single-layer blade, and the protruding structure is in interference fit with the corresponding cantilever to generate damping force. The structure has the advantages of being simple in structure, easy to machine, uniform in damping force and good in hand feeling.