The utility model discloses a stem washing machine, which comprises a water tank and a net belt. The lower end of the net belt is positioned in the opening above the water tank. The utility model also comprises a bath tank and a settling tank. The settling tank comprises a water inlet and a water outlet, and a downwardly concave trough body which is positioned between the water inlet and water outlet. The water outlet is positioned above the lower end of the net belt. The bath tank comprises a feeding end and a discharging end, and the discharging end is connected with the water inlet of the settling tank. Due to the additional arrangement of the bath tank and settling tank of the utility model, when the tobacco stem enters the settling tank with the water, wherein the heavy debris like the metal and stones etc can directly be settled at the bottom of the concave trough and the relative light debris like the rubber can also settle in the settling tank, owing to the full infiltration and elimination of the influences caused by the surface tension of the water. Therefore the utility model has a better ability of elimination for the debris with the light gravity like the rubber etc.