A nasal plug breathing apparatus comprises a connecting unit, a nasal plug unit that can be detachably mounted to the connecting unit, and a gas unit and a head band unit respectively assembled with the connecting unit. The connecting unit includes a body, two side blocks extending from the body, an inlet hole disposed in the body, a collar formed in the body and located outside the inlet hole, and two positioning slots respectively disposed with the two side blocks the nasal plug unit includes a front wall, a rear wall, a connecting wall, a sleeve hole disposed in the front wall to sleeve outside the collar, two positioning columns respectively provided in the connecting wall for placement of the two positioning slots, and two nasal plug heads respectively formed from the rear wall. In this way, it is easy to replace the nasal plug unit and improve the quality of use.一種鼻塞式呼吸器,包含一連結單元,一呈可卸除地安裝於該連結單元的鼻塞單元,及分別組裝於該連結單元的一輸氣單元、一頭帶單元。該連結單元包括一本體,自該本體延伸的二側塊,一設置於該本體的進氣孔,一成型於該本體並位於該進氣孔外的套環,及分別設置於該二側塊的二定位槽,該鼻塞單元包括一前壁與一後壁和一連結壁,一設置於該前壁供套置在該套環外的套孔,分別設置於該連結壁供置入該二定位槽的二定位柱,及分別自該後壁成型的二鼻塞頭。藉此,可以方便拆換該鼻塞單元,且可提高使用品質。10‧‧‧連結單元11‧‧‧本體112‧‧‧前面12‧‧‧側塊121‧‧‧後側面14‧‧‧套環15‧‧‧凸環151‧‧‧環槽16‧‧‧定位槽17‧‧‧固定柱18‧‧‧容置空間20‧‧‧鼻塞單元21‧‧‧前壁22‧‧‧後壁23‧‧‧連結壁231‧‧‧側部24‧‧‧套孔25‧‧‧定位柱251‧‧‧擋緣26‧‧‧鼻塞頭30‧‧‧輸氣單元31‧‧‧連接筒311‧‧‧插環312‧‧‧凸緣313‧‧‧彈性扣勾32‧‧‧輸氣管41‧‧‧側帶411‧‧‧第一穿孔
