Sputum excretion instrument

The sputum excretion instrument provided by the embodiment of the invention comprises a shell, a vibration part, a power supply part, a pressure sensor and a controller, the controller is electrically connected with the vibration part, the power supply part and the pressure sensor, and the controller is used for controlling the vibration part to beat a patient at a first frequency, acquiring a pressure value measured by the pressure sensor, judging whether the pressure is within a preset range, and when the pressure value is within the preset range, continuing to control the vibration component to beat the patient at a first frequency; when the pressure value is lower than the minimum value of the preset range, increasing the working frequency of the vibration component on the basis of the first frequency until the measured pressure value is within the preset range; and when the pressure value is higher than the maximum value of the preset range, reducing the working frequency of the vibration component on th