The invention discloses a percussion head of an expectoration instrument, relates to the field of expectoration instruments, and provides the percussion head which achieves percussion through linear motion and is used for the expectoration instrument. The percussion head of the expectoration instrument comprises a shell, an end cover, a motor, a driving disc, a vibration disc, reset springs, a flexible head, an adjusting sleeve and a handle; at least two guide pillars are connected to a lower end plate of the shell; the end cover covers a main shell body; the motor, the driving disc, the vibration disc and the reset springs are coaxially arranged in the main shell body from top to bottom; the motor is connected with the end cover; the driving disc is connected with the motor, bearings arearranged between the driving disc and the main shell body and limit the driving disc to axial movement, an annular driving track is arranged on the driving disc, and the surface of the annular drivingtrack is in a wavy shape; the vibration disc sleeves the guiding pillars, and balls are arranged on the vibration disc; the reset springs make the balls be in contact with the annular driving track;the flexible head is connected with the vibration disc, and the adjusting sleeve is connected with the shell and is adjustable in axial position; the handle is connected with the main shell body.