Back percussion expectoration device

The utility model discloses a back percussion expectoration device which comprises a fixing plate, a percussion mechanism is arranged on the right side of the fixing plate, a first spring is fixedly connected to the position of a middle shaft of the bottom of the fixing plate, a plastic rod is fixedly connected to the bottom end of the first spring, a rubber ball is movably connected to the bottom end of the plastic rod, an inserting groove is formed in the bottom of the plastic rod, and the rubber ball is movably connected to the bottom end of the inserting groove. And the top of the rubber ball is fixedly connected with an insertion block. By holding the plastic rod with a hand and tapping the back of a patient with the inflatable bag, cough of the patient is relieved, by arranging the rubber ball, the throat of the patient can be pressed, cough of the patient is relieved, when the rubber ball is damaged after being used for a long time, the shifting block can be shifted upwards, finally, the clamping block