Broadband laser cladding technology is widely used in the reinforcement, repair and modification of large surface, and less lap times make it easier to get better quality and the higher efficiency. In order to solve the problems of uneven heating of metal powder and low coaxial coupling accuracy in the current broadband laser cladding, an inside-laser powder feeding broadband laser cladding method has been designed, which can realize uniform powder feeding and exactly perpendicular to the surface of molten pool inside the laser. Two cladding accumulation experiments have been done on the horizontal and 30° inclined walls, and both of them achieve straight wall with uniform height of melt layer. The results show that molten pool is not sensitive to gravity. The microstructure analysis of molten layer shows that the microstructure in secondary remelting zone is relatively coarse, and the microstructure in non- overlapping zone is composed of more dendrites. The microhardness fluctuation of them is about 90HV0.5. The microstructure of the cladding layer is relatively uniform and densification.