Closed wide angle environmental protection type coarse sandblasting cleaning machine and use method thereof

The invention provides a closed wide angle environmental protection type coarse sandblasting cleaning machine and a use method thereof. The technical scheme of the closed wide angle environmental protection type coarse sandblasting cleaning machine is that an up and down direction moving hydraulic cylinder (7) and a left and right direction moving hydraulic cylinder (10) are connected with a spraygun and a fixed block (9) correspondingly and are fixed on a cleaning machine main body (8), a rotation workbench (11) is connected with a rotation workbench driving motor (12) through a transmissionshaft, the rotation workbench driving motor (12) is fixed inside the cleaning machine main body (8), the upper face is wrapped with a rubber sheet, one end of a hoister (4) is located at the bottom of the cleaning machine main body (8), the other end of the hoister (4) is connected with the upper portion of a separating machine (3), a separating machine supporting rack (1) is internally providedwith the separating machine