Solar-powered building plate polishing mechanism and using method thereof

Disclosed are a solar-powered building plate polishing mechanism and a using method thereof. The solar-powered building plate polishing mechanism comprises a supporting shell (8), a workbench (82) arranged in the supporting shell (8), a screw (18) and an extensible locking part (5) slidably mounted in a cavity (50) on another lateral side of the supporting shell (8), a shielding door (81) is connected on one lateral side of the supporting shell (8) in a pivoting manner, the screw (18) can be driven by a movable driving motor (1) to rotate so as to push a polishing component (6) provided with a bottom polishing head (61) to move leftwards and rightwards along a guide cross beam 97) fixedly arranged in the supporting shell (8) and positioned above the workbench (82), and the polishing component (6) is provided with a power mechanism to drive the polishing head (61) to polish building plates carried on the workbench (82).