An amnion insertion device has been developed for an emergency cervical cerclarge operation to push back the bulged amnion into the uterus. The present invention is configured with a dilation balloon that forms at the front end portion of the air injection tube for stably supporting a support. Once the dilation balloon is inflated the inflated state will prevent deflation or sliding backwards during the cervical cerclarge operation while the bulged amnion is being pushed back into the uterus to facilitate the operation. Because the external tube and air injection tube have integrally formed a dual-tube configuration, a surgeon on duty can entirely grip the amnion insertion device by one hand, and will have the other hand free to stitch up the cervix.