The invention discloses a respiratory tract cleaning and sputum excretion device for the pediatric department, which comprises a sputum suction machine; a first sputum guide pipe is fixed to the input end of the sputum suction machine, a socketed pipe is fixed to the other end of the first sputum guide pipe, and a second sputum guide pipe is inserted into an inner cavity of the socketed pipe in a sleeved mode. According to the invention, a first outer pipe and a second pipe tubes can be inserted into the throat pipe from the oral cavity in advance, meanwhile, a torsional spring enables the pressing plate to extrude the second outer pipe to keep the downward radian all the time, the second sputum guide pipe penetrates through the outer pipe to conduct sputum suction operation, the second sputum guide pipe can be prevented from making contact with the tonsil, so that a child does not feel uncomfortable to cause counteracting actions, meanwhile, a protective rubber film is shielded between the outer pipe, the inner cavity of the child is prevented from being pinched when the outer pipe move, the two supporting plates can open the oral cavity of the child by rotating an outer rod, medical staff can rotate or pull the sputum suction pipe easily, the sputum suction operation is easier, a mounting plate can block the stop block, the outer pipe pre-arranged in the oral cavity is prevented from sliding into the throat pipe of the child, and the use safety of the device is improved.