Atmosphere manufacturing chamber, laser three-dimensional forming processing system and processing method

The invention relates to the technical field of laser three-dimensional forming, in particular to an atmosphere manufacturing chamber and a laser three-dimensional forming machining system and method. The atmosphere manufacturing chamber comprises a box body and a flexible sealing cover, the top of the box body is provided with an operation opening used for allowing the laser head to stretch into the box body, the flexible sealing cover and the operation opening are fixed in a sealed mode so that a machining chamber can be defined by the flexible sealing cover and the box body, and the flexible sealing cover is provided with a penetrating opening used for allowing the laser head and the mechanical arm to penetrate through. The atmosphere manufacturing chamber further comprises a sealing fixing piece used for fixing the penetrating opening and the mechanical arm in a sealed mode, an air inlet is further formed in the box body, and the air inlet can be used for introducing inert gas into the machining chamber s