A laser irradiation apparatus using a robot, comprising: a scanner for scanning an object to collect a raw data; a vision controlling unit for constituting a three-dimensional image of the object on the basis of the raw data, and setting a region of interest (ROI) on the surface of the object in the three-dimensional image; a motion controlling unit for setting a guide path (GP) passing through the region of interest (ROI); and a robot arm , having an end-effector , for irradiating a laser on the surface of the object corresponding to the guide path (GP), wherein the robot arm comprises: a first base part ; a second base part being coupled to be rotatable on the first base part ; a first link being coupled so that it can swing on the second base part ; a second link being coupled so that it can swing on the first link ; an auxiliary link having one end coupled to the second base part and the other end coupled to the second link ; a laser unit , arranged on the first base part , for generating the laser; a first motor part , arranged on the first base part , for rotating the second base part ; a second motor part , arranged on the second base part , for swinging the first link ; and a third motor part , arranged on the second base part , for swinging the second link through the auxiliary link . a scanner for scanning an object to collect a raw data; a vision controlling unit for constituting a three-dimensional image of the object on the basis of the raw data, and setting a region of interest (ROI) on the surface of the object in the three-dimensional image; a motion controlling unit for setting a guide path (GP) passing through the region of interest (ROI); and a robot arm , having an end-effector , for irradiating a laser on the surface of the object corresponding to the guide path (GP), wherein the robot arm comprises: a first base part ; a second base part being coupled to be rotatable on the first base part ; a first link being coupled so that it can swing on the second base part ; a second link being coupled so that it can swing on the first link ; an auxiliary link having one end coupled to the second base part and the other end coupled to the second link ; a laser unit , arranged on the first base part , for generating the laser; a first motor part , arranged on the first base part , for rotating the second base part ; a second motor part , arranged on the second base part , for swinging the first link ; and a third motor part , arranged on the second base part , for swinging the second link through the auxiliary link . a first base part ; a second base part being coupled to be rotatable on the first base part ; a first link being coupled so that it can swing on the second base part ; a second link being coupled so that it can swing on the first link ; an auxiliary link having one end coupled to the second base part and the other end coupled to the second link ; a laser unit , arranged on the first base part , for generating the laser; a first motor part , arranged on the first base part , for rotating the second base part ; a second motor part , arranged on the second base part , for swinging the first link ; and a third motor part , arranged on the second base part , for swinging the second link through the auxiliary link . <EOS>