Flow stage car is a special type of vehicle that facilitates mobile performances and can be developed into a stage; The new mobile stage vehicle is equipped with an LED display screen, also known as an LED mobile stage vehicle. The fully automatic mobile stage car body is a specialized vehicle that is automatically unfolded and built into a performance stage with a ceiling and stage board through mechanical devices, and equipped with stage lighting, sound system, power interface, automatic control system and other equipment. The overall structure of the stage car on the mobile stage vehicle is composed of aluminum profiles and stamped parts. The outer panel is an aluminum alloy flat plate, and the interior is made of waterproof plywood. The stage board of the Chengli stage vehicle is made of waterproof, anti slip, and fireproof belly plywood; The side panel and top panel are controlled by four hydraulic cylinders to unfold and form the top of the stage, while the bottom panel unfolds and is controlled by four hydraulic cylinders to form the stage. This eliminates the need for traditional staging procedures, saves time and effort, is easy to operate, safe and reliable, has complete functions, and has a beautiful appearance.