The invention relates to an oxygen supply machine structure, which includes: the oxygen supply machine structure is provided with a power group, a coupling group and a power shaft group, the coupling group is provided with a coupling piece and a bearing, the coupling part of the main shaft pipe is fixed with one end of the shaft rod, the main shaft pipe is penetrated in the coupling piece and the bearing, that is to say, the coupling piece and the bearing are sleeved and pivoted on the main shaft pipe. When the shaft rod drives the main shaft tube to rotate, the two end systems of the main shaft tube have support, and are not easy to shake or separate from the shaft rod at will during rotation.本創作係關於一種供氧機結構，其係包括：該供氧機結構係設有動力組、套合組及動力軸組，該套合組係設有套合件及軸承，該主軸管之該結合部係與該軸桿一端相固設，該主軸管係穿設於該套合件及該軸承內，即該套合件及該軸承係套合樞設於該主軸管上，當該軸桿帶動該主軸管轉動時，該主軸管二端係具有支撐，而不易於轉動時隨意搖晃或與該軸桿相脫開。
