Abstract: A fan-oscillating device includes a housing unit mounted to a fan head, a control rod movable between an engagement position and a disengagement position, and a rotatable wheel rotatable on the housing unit only when the control rod is disposed in the engagement position. A link-connecting member is disposed rotatably on the rotatable wheel, and has an eccentric portion. A link has two ends connected respectively and pivotally to the fan head and the eccentric portion. When the control rod is rotated, the link-connecting member rotates relative to the rotatable wheel so as to adjust a distance between the eccentric portion of the link-connecting member and a rotating axis of the rotatable wheel, thereby resulting in a change to an oscillation angle of the fan head.