A surface
machining device for boards comprises a shell (1), a
gear drive motor (351), a threaded toothed sleeve (35), a threaded sleeve (2), a hollow shaft motor (29), an inner threaded block (24) and an inner screw part (4), wherein the
gear drive motor (351) is mounted on the shell (1), the threaded toothed sleeve (35) can peripherally rotate through a bearing and is axially fixedly mounted in the cavity (10) of the shell (1), the threaded sleeve (2) is matched with the threaded toothed sleeve (35), the hollow shaft motor (29) is axially fixedly mounted in the cavity (20) of the threaded sleeve (2), the inner threaded block (24) can be driven by the hollow shaft motor (29) to rotate and is axially fixed, the inner screw part (4) is matched with the inner threaded block (24) in a threaded manner, and the
gear drive motor (351) meshes with the threaded toothed sleeve (35) through a power-connection gear (352).