A method for laser descaling of a moving metal product having an oxide layer on its surface, said method using laser descaling, characterized in that : - at least a first laser with a wavelength equal to that of the lasers used for the descaling, or preferably a group of such first lasers , each send a ray that is reflected on the oxidized surface of the product to be descaled, said rays reflected by the oxidized surface being intercepted by sensors that send the information they collect into a processing unit ; - a processing unit calculates the absorption of the ray by the surface of the product, from information collected by the sensors , deduces the emissivity of the oxidized surface of the metal product therefrom in the direction of said reflected rays , and correlates this emissivity with reference information prerecorded inside processing unit ; - at least one second laser , or preferably a group of such second lasers , each send pulses of a ray onto the surface of the product to descale it, the spots of said pulses of said rays covering the entire surface to be descaled using optical and/or mechanical scanning laterally moving the spots of the rays on the surface of the product, or an optical system transforming the spots into lines, said second laser(s) being controlled by a control unit receiving information provided by the processing unit making it possible to determine the operating parameters to be imposed on said second lasers to obtain the descaling of the surface of the product, compared with experimental results prerecorded in the control unit ; - and means for inspecting the descaled surface of the product verifying the effectiveness of the descaling by detecting any persistence of areas that have not been descaled, or that have been descaled poorly. - at least a first laser with a wavelength equal to that of the lasers used for the descaling, or preferably a group of such first lasers , each send a ray that is reflected on the oxidized surface of the product to be descaled, said rays reflected by the oxidized surface being intercepted by sensors that send the information they collect into a processing unit ; - a processing unit calculates the absorption of the ray by the surface of the product, from information collected by the sensors , deduces the emissivity of the oxidized surface of the metal product therefrom in the direction of said reflected rays , and correlates this emissivity with reference information prerecorded inside processing unit ; - at least one second laser , or preferably a group of such second lasers , each send pulses of a ray onto the surface of the product to descale it, the spots of said pulses of said rays covering the entire surface to be descaled using optical and/or mechanical scanning laterally moving the spots of the rays on the surface of the product, or an optical system transforming the spots into lines, said second laser(s) being controlled by a control unit receiving information provided by the processing unit making it possible to determine the operating parameters to be imposed on said second lasers to obtain the descaling of the surface of the product, compared with experimental results prerecorded in the control unit ; - and means for inspecting the descaled surface of the product verifying the effectiveness of the descaling by detecting any persistence of areas that have not been descaled, or that have been descaled poorly. <EOS>