The utility model relates to an inflatable restraint device, which is suitable for binding a limb to a certain range of activity, and the inflatable restraint device comprises a ring set and a fixed unit.The ring kit comprises an inflatable annular belt body and an air valve arranged on the annular belt body to restrict the gas flow in and out of the annular belt body.The annular belt body forms a girdle space for the limb to pass through.The fixing unit is arranged on the annular belt body and comprises a fixing belt suitable for connecting a fixed object.By means of the inflatable annular belt body and the air valve arranged on the annular belt body to restrict the gas flow in and out of the annular belt body, the annular belt body is soft, thereby avoiding injury to the limb constrained by the annular belt body.一種充氣式約束裝置，適用於將一肢體束縛在一定的活動範圍內，該充氣式約束裝置包含一環套件，及一固定單元。該環套件包括一可充氣的環形帶體，及一設於該環形帶體以限制氣體進出該環形帶體的氣閥。該環形帶體形成一可供該肢體穿置的圍束空間。該固定單元設於該環形帶體，並包括一適用於連接一固定物的固定帶。藉由可充氣的該環形帶體，及設於該環形帶體以限制氣體進出該環形帶體的該氣閥，使該環形帶體較為柔軟，進而避免使被該環形帶體約束的該肢體受到傷害。
