The present invention discloses an abdomen percussion device for clinical examination in internal medicine department. The abdomen percussion device comprises a placement plate, a motor is arranged onan upper surface of the placement plate, a fixing rod is fixedly connected to an output end of the motor, a disk is fixedly connected to one end of the fixing rod, a fixing block is fixedly connectedto one side of the disk, a first rod body is fixedly connected to a lower surface of the fixing block, a first L-shaped plate is welded to a lower surface of the placement plate, a first plate body is welded to one side of the first L-shaped plate, a second limiting sliding groove is formed in one side of the first plate body, a first limiting sliding block is slidably connected to an inner sidewall of the second limiting sliding groove, through a combined arrangement of a first threaded rod, a third plate body, a first limiting sliding groove, a second limiting sliding block and other components, the abdomen percussion device can be conveniently fixed and adjusted, meanwhile, abdomen sizes and percussion positions of different patients can be conveniently adjusted, diagnosis results ofabdomen percussion are more accurate, operation is easy, and medical staff can use the abdomen percussion device conveniently.