Door lock indicating device based on pneumatic action

The invention provides a door lock indicating device based on pneumatic action, and relates to the technical field of door locks. The door lock indicating device based on the pneumatic action comprises a door frame and a door lock indicating mechanism, wherein the side surface of the door frame is fixedly connected with a mounting plate; the door lock indicating mechanism is connected with the mounting plate and the door frame and comprises an elastic air bag, a connecting plate, a mounting seat, a protective sleeve, an indicating air bag, an internal thread air channel, an external thread connecting pipe and a magnetic strip; the rear end face of the door frame is connected with the elastic air bag through the connecting plate; when a door is closed, the movable door is in contact with the elastic air bag; the outer surface of the mounting plate is fixedly connected with the mounting seat; the internal thread air channel is formed inside the mounting seat and communicates with the elastic air bag through an