Aiming at the problem that the laser cladding process is difficult to accurately control due to the heat input, the molding accuracy and quality are difficult to achieve the expected problem. By building a laser cladding molten pool monitoring system, the size of the molten pool was accurately measured, and the relationship between the cladding parameters and the shape of the molten pool was obtained. Using the color CCD colorimetric temperature measurement method, a pseudo-color temperature map that can display the temperature field distribution is obtained. The results show that the morphology of molten pool changes greatly with the change of laser power. The influence of the change of powder feeding rate on the morphology of molten pool is not obvious. Due to heat accumulation, the “tailing phenomenon” of the molten pool always exists in the entire cladding process of the molten pool, and it will become more obvious with the increase of power. This makes the area of the molten pool measured by the CCD camera fail to accurately reflect the changes in the molten pool during the cladding process. Therefore, in the subsequent design of the laser cladding closed-loop control system, the width information of the cladding pool should be selected as the variable in order to achieve the purpose of high quality cladding.