An abdominal respiration training aid comprises an inflatable abdominal belt, a nose cover, a respiration pipeline, an air pump, an extension-type air bag and a main machine circuit, wherein the extension-type air bag is connected with an air cushion in the inflatable abdominal belt through a first way air guide pipeline and a second way air guide pipeline, the air cushion in the inflatable abdominal belt is connected with the air pump through a third way air guide pipeline, at least the first way air guide pipeline and the second way air guide pipeline are provided with valves, the nose cover is connected with the respiration pipeline, the respiration pipeline is connected with a sensor, the sensor is used for detecting respiration frequency, the main machine circuit opens or closes the valves according to detection signals fed back by the sensor, and the air cushion in the inflatable abdominal belt can exhaust air into the extension-type air bag according to respiration rhythms, or the air cushion in the inflatable abdominal belt can store air from the extension-type air bag. The abdominal respiration training aid can help people to carry out abdominal respiration training and to develop an accurate respiration mode, and plays significant roles in increasing vital capacity, oxygen delivery capacity and a cardio-pulmonary function, discharging abdominal waste, improving abdominal blood circulation, and prolonging the life.