Disclosed is an external surface steam circulation type bone forming roller. The outer surface steam circulation type bone forming roller according to the present invention includes a hollow cylindrical body in which grooves for bone forming are formed on an outer circumferential surface, and first and second shaft portions coupled to both ends of the cylindrical body to become rotational axes of the cylindrical body Body portion comprising a; A plurality of steam passages arranged on the thickness surface of the cylindrical body and being snowed in the longitudinal direction; A supply path and a discharge path that are spaced apart from each other in the first shaft portion and are respectively radially sloping along the radial direction of the cylindrical body to alternately communicate with the steam path; An outflow passage formed along the rotation axis in the first shaft portion and configured to have a first space on the outside communicating with the supply passage and a second space on the inside communicating with the discharge passage; And a confluence groove formed in a ring-shaped groove along the inner circumferential surface of the cylindrical body in contact with the second shaft portion and communicating with the steam passage, wherein the diameter of the steam passage, the supply passage and the discharge passage are respectively ordered. It is characterized by being smaller as it is. According to the present invention, it is possible to enhance the ease of processing and the efficiency of roller manufacturing efficiency as one integrated steam circulation circuit is formed in one step, which is organically communicated with each other through a simple coupling process of the body part rather than a complicated manufacturing process. have.
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