A heat-dissipating structure includes a support unit and a fan unit disposed in the receiving space. The support unit has a plane portion, a support portion extending downwards from a front side of the plane portion, and an opening passing through the plane portion. The plane portion has a board body, a concave space formed on the top surface of the plane portion, a non-skid pad detachably received in the concave space, a slender block body disposed on a base of the top surface of the board body, and a slender non-skid body disposed on a base of the bottom surface of the board body. The support portion has a support body, a receiving space formed in its inside, a plurality of slender openings formed on two opposite lateral sides of the support body, and a slender non-skid body disposed on a base of the support body.