Metal additive manufacturing molten pool morphology multi-angle visual sensing device based on single camera

The invention provides a metal additive manufacturing molten pool morphology multi-angle visual sensing device based on a single camera. The sensing device comprises three parts, including a sensing path, a composite light filtering system and an image detection system, a first plane mirror receives light rays radiated from a molten pool from above and reflects the light rays to the composite light filtering system, and molten pool width information is obtained through the image detection system; the light rays radiated by the molten pool and arc light reflected by the previous stacking layer are reflected by a third plane mirror to reach a second plane mirror and then pass through the composite light filtering system, and finally the height information of the molten pool and the height information of the previous stacking layer are obtained through the image detection system; and the multi-angle visual sensing device can simultaneously display height information of the molten pool, and width information of t