Rectangular metal shell polishing device and polishing method thereof

The invention provides a rectangular metal shell polishing device and a polishing method thereof.The polishing device comprises a horizontal conveying belt, an annular vertical conveying belt is arranged on one side of the horizontal conveying belt, a plurality of clamps are arranged on the outer side of the annular vertical conveying belt, fixed electromagnets are arranged at the tops of the clamps, and a positioning mechanism is arranged between the annular vertical conveying belt and the horizontal conveying belt; the positioning mechanism comprises a support, a rotating motor is arranged on the support, a rotating table is arranged at the output end of the rotating motor, vertical air cylinders are arranged at the two ends of the rotating table, clamping electromagnets are arranged at the telescopic ends of the vertical air cylinders, a plane polishing system is arranged on one side of the annular vertical conveying belt, and side face polishing systems are arranged inside and outside the annular vertical