A semiconductor laser blood oxygen therapeutic apparatus comprising a host (32); a terminal being an oxygen output terminal, a laser irradiating terminal and an ozone output terminal (48), a laser generator located in a therapeutic terminal (34); the oxygen output terminal includes an oxygen absorbing device (25) and a laser-oxygen two-in-one therapeutic device (27); the laser-oxygen two-in-one therapeutic device (27) is provided with a two-in-one nasal clip (31); the oxygen absorbing device (25) is provided with a detachable atomization pressure decreasing device (24), while the host (32) is provided with a security identifying device which identifies the external atomization pressure decreasing device automatically; and an ozone generating cabin (36) is connected between a relief pressure valve (20) and a humidifying bottle (9).