Sealing online detection system for small size flexible packaging bag

The invention discloses a sealing online detection system for a small size flexible packaging bag. The system comprises a first, second and third conveyor belts respectively used for conveying a packaging bag to be inspected, a packaging bag to be inspected placed in an array and a qualified packaging bag, a first and second gripping mechanisms of a mechanical arm with a machine vision system, a sealed compartment, a frame, an air pressure source for vacuuming or pressurizing the sealed compartment and a controller; the sealed compartment is composed of a drawer-shaped compartment body, an aircylinder driving the compartment body, an air pressure sensor for measuring the air pressure in the compartment body, first and second air valves, a light source and a camera and is mounted on the frame, and a closed container is formed when the compartment body and the first and second air valves are closed; when the compartment body is closed, the first air valve connected to the air pressure source controls the connec