Photocuring micro-nano 3D printing equipment and printing method for achieving gradient mechanical structure through gray scale regulation and control

The invention discloses a photocuring micro-nano 3D printing device and method for achieving a gradient mechanical structure through gray level regulation and control, the photocuring micro-nano 3D printing device comprises a base, a light machine module, a printing platform and a material groove, the light machine module is arranged on a horizontal section of an L column and comprises a dimmable machine I, a dimmable machine II and a dimmable machine III which are arranged in an array in the y direction, and the dimmable machine I, the dimmable machine II and the dimmable machine III are arranged in the horizontal section of the L column. The material groove is formed in the base, an opening of the material groove faces upwards, the material groove can rotate around a vertical center rotating shaft and is adjusted in the x direction, the y direction and the z direction, the printing platform is arranged in the material groove and comprises a workbench, a U-shaped block and a connecting block, and the workben