An emergency breathing apparatus for dealing with the situation of foreign object stuck in respiratory tract, comprising: a piston device, a one-way valve set switch structure and a mask assembly. The piston device comprises a piston body, a cylinder and a connecting valve. The cylinder comprises two ends, a first end allowing the piston body to pass in and out, a second end comprising a cylinder hole. The connecting valve is located on the second end of the cylinder for connecting the mask assembly. The one-way valve set switch structure comprises a turning plate, a first one-way valve and a second one-way valve. The first one-way valve and the second one-way valve are located on the turning plate. The first one-way valve allows air to flow through the cylinder only from outside to inside. The second one-way valve allows air to flow through the cylinder only from inside to outside. By means of the turning plate, either the first one-way valve or the second one-way valve can be selectively in alignment with the cylinder hole.一種用於異物阻塞呼吸道時之急救呼吸裝置,包含:一活塞裝置、一單向閥組切換結構和一面罩組件。該活塞裝置包含一活塞本體、一套筒、與一連接閥。該套筒有兩端,第一端開口以容許活塞本體進出,第二端有一套筒通口。該連接閥位於套筒的第二端,用以連接面罩組件。該單向閥組切換結構包含一轉盤和連通於該轉盤之一第一單向閥和一第二單向閥。該第一單向閥使氣體僅能從該套筒的外部流入該套筒的內部,該第二單向閥使氣體僅能從該套筒的內部流向該套筒的外部。該轉盤可選擇性地使第一單向閥或第二單向閥的其中之一對準該套筒通口。1‧‧‧活塞裝置2‧‧‧單向閥組切換結構3‧‧‧面罩組件11‧‧‧活塞本體12‧‧‧套筒13‧‧‧連接閥20‧‧‧轉盤21‧‧‧閥門組31‧‧‧面罩32‧‧‧氣管33‧‧‧接口121‧‧‧第一套筒端122‧‧‧第二套筒端131‧‧‧連接閥通口201‧‧‧第一轉盤面202‧‧‧第二轉盤面203‧‧‧轉盤通口211‧‧‧第一單向閥212‧‧‧第二單向閥1211‧‧‧套筒開口1221‧‧‧端面1223‧‧‧套筒通口
