A cleaning device for a hemming roller cleans the hemming roller of a hemming roller unit mounted on an arm tip of a hemming robot. The cleaning device includes: a support frame installed on a floor of a workshop; a roller rotation unit that is installed on an upper surface of the support frame and rotates the hemming roller that has entered the upper surface of the support frame through the hemming robot; and a scraper that is installed to be movable back and forth on the support frame while facing the roller rotation unit and removing foreign substances on the surface of the hemming roller.