The invention proposes a kind of bone nail which is suitable for hot-melt implantation to the bone correction or diseased bone, which comprises a polylactic acid coating layer, a magnesium metal block (or a magnesium alloy block), and a magnesium metal block (or a magnesium alloy block) which is arranged in the polylactic acid coating layer without exposure.本創作提出一種適用於熱熔植入至骨矯正處或病骨的骨釘，其包含：一聚乳酸包覆層、以及一鎂金屬塊體（或一鎂合金塊體），鎂金屬塊體（或鎂合金塊體）為未裸露地設置於聚乳酸包覆層內。
