The invention discloses a method for forming a loop type heat pipe with the pipe ends in butt joint. The method mainly comprises the step that a hollow pipe body is taken, wherein the hollow pipe body comprises the two pipe ends, a loop type segment, an insertion portion, a sleeving portion, a tight-fit segment and a loose-fit segment, and a loop type runner space inside the hollow pipe body is in a vacuum closed state and contains a working solution; the insertion portion is arranged at one of the pipe ends of the hollow pipe body; the sleeving portion is arranged at the other pipe end of the hollow pipe body, and the sleeving portion is used for being assembled to the outer circumference of the insertion portion in a sleeving manner; the tight-fit segment is arranged at one local segment of an insertion and sleeving part between the insertion portion and the sleeving portion, and through the tight-fit segment, the insertion portion and the sleeving portion are mutually in the tight-insertion airtight state; and the loose-fit segment is arranged at the other local segment of the insertion and sleeving part between the insertion portion and the sleeving portion, and through the loose-fit segment, a gap is formed between the insertion portion and the sleeving portion. By means of the method for forming the loop type heat pipe with the pipe ends in butt joint, the loop type heat pipe can achieve the practical and advancement performance that constituent components and production formation steps are substantially simplified, manufacturing cost is substantially lowered, and good heat dissipation efficiency is maintained; and good industrial economic benefits are achieved.