The invention discloses a multifunctional clinical breathing device. The device comprises an adjusting unit, the adjusting unit comprises a guide rail, a through groove, a sliding block, a support plate, a first connecting rod, a pin shaft, a second connecting rod and an electric push rod, wherein the guide rail is provided with two surfaces symmetrically arranged on two sides of a surface of a center plate, the through groove is arranged on an inner side surface of the guide rail, an upper surface and a lower surface of the sliding block are respectively connected with an upper surface and alower surface of the through groove in a sliding mode, the support plate is provided with two surfaces symmetrically arranged on the sliding block, one end of the first connecting rod is rotatably connected to a side of the supporting plate, the pin shaft is rotationally connected to a side of one end of the guide rail, one end of the second connecting rod is provided on a side of the pin shaft, center of the first connecting rod and the second connecting rod are connected by cross rotation of a cylindrical pin, one end of the electric push rod is provided on a side of the other end of the guide rail, and the other end of the electric push rod is fixedly connected to a side of the guide rail. The device has certain portability and various functions, and has strong practicability for outdoor medical rescue.