Selective laser additive manufacturing powder laying device for heterogeneous materials and additive manufacturing method

The invention provides a selective laser additive manufacturing powder laying device for heterogeneous materials and an additive manufacturing method. The selective laser additive manufacturing powder laying device for the heterogeneous materials comprises a controller and a lathe bed, an annular supporting frame is fixedly connected to the top of the lathe bed, and a workbench is arranged in the annular supporting frame; a forming cavity is formed in the center of the workbench, three adjacent powder feeding cavities and three adjacent recycling cavities are evenly formed in the positions, located on the periphery of the forming cavity, of the workbench, and the three powder feeding cavities and the three recycling cavities are arranged in a central symmetry mode relative to the forming cavity; and an annular support driven by a first power device is slidably connected to the top of the annular supporting frame, an annular plate is fixedly connected to the top of the annular support, and a powder scraping pl