The invention discloses an assembly mechanism based on an automobile safety air bag. The mechanism is provided with a machine frame, a rotating disc mechanism is arranged in the middle of the machineframe, a sleeve assembly mechanism, a riveting mechanism and a detection mechanism are sequentially arranged on the outer periphery of the rotating disc mechanism and fixed to the machine frame, a plurality of rotating disc clamp devices are evenly fixed to the upper surface of a rotating disc of the rotating disc mechanism, the rotating disc clamp devices are provided with rotating disc clamps and rotating disc clamp locking parts, and the rotating disc clamp locking parts are clamped into the rotating disc clamps. The sleeve assembly mechanism is provided with a sleeve assembly conveying device and a sleeve assembly moving device. Sleeves are conveyed to the sleeve assembly moving device through the sleeve assembly conveying device, and placed to the rotating disc clamps through the sleeve assembly moving device. The riveting mechanism is provided with a riveting support, a riveting push device, a riveting material supply device and a locking device. The riveting support is fixed tothe machine frame, the riveting push device is fixed to the top of the riveting support, and the riveting material supply device is fixed to the middle of the riveting support and the lower portion ofthe riveting push device.