A method for manufacturing a heat pipe and a capillary structure thereon is provided, and the steps of the method are as follows. A hollow pipe which has an open end and a closed end is provided. A mold is placed into the hollow pipe through the open end. The mold includes a central rod and a shaping component mating with the central rod, and the shaping component has an outward shaping surface. A powder is filled into the space between the hollow pipe and the mold through the open end and then sintered to form a capillary structure on the inner wall of the hollow pipe, in which the capillary structure has a profile corresponding to the shaping surface of the shaping component. Thereafter, the central rod and the shaping component are sequentially taken out of the hollow pipe.