Provided is a mold cleaning system which makes it possible to prevent scratches on a molding surface while efficiently removing dirt therefrom without requiring a manual operation by a person, even for molds having complicated molding-surface shapes. When cleaning a mold (11), the mold cleaning system acquires three-dimensional image data of a molding surface (12) of the mold (11) by a camera (3) and, on the basis of the acquired image data, the mold cleaning system controls the movement of arms (6a, 6b) using a control device (7), moves a laser head (4) along the molding surface (12) while irradiating with a laser beam (L) supplied by a laser oscillator (2) and, as a result, removes dirt (X) adhered to the molding surface (12).