The invention provides an automatic water supply moist heating tank for respiratory medicine.An automatic water supply structure is arranged in the tank body, and a support which can be fixed in the tank body up and down by displacement is arranged under the water injection hole.And a water blocking pad is attached to the upper end of the pillar.And a buoy connected to the bottom of the heating tank is arranged under the said pillar, which can fluctuate with the water level up and down without horizontal deviation；When the water is injected through the water injection hole to the established water level,The pontoon pushes the prop with the rise of water level.Make the water blocking pad at the upper end of the pillar block the water injection hole.And then stop the water injection hole to re-enter the water；When the ventilator is in operation, the heated moist gas is discharged from the tank.The pontoon drives the pillar and water blocking pad to fall with the water level.Refill the tank with water.Then it can automatically add water.本創作提供一種用於呼吸醫療之自動給水潮濕加熱罐，罐體內設有自動給水結構係自注水孔之下方設有一可上下位移地固定於前述罐體內之支柱，且前述支柱之上端附接一阻水墊，而前述支柱下方設有一連接於前述加熱罐底部可隨水位上下起伏不會水平偏移之浮筒；當水經由注水孔注水至既定的水位，該浮筒隨水位上升推動支柱，使支柱上端之阻水墊擋住注水孔，進而停止注水孔再進水；當呼吸機運作時將加熱之潮濕氣體排出罐體，浮筒帶動支柱及阻水墊隨水位下降，使水再度注入罐體，進而達到自動加水之功能。
