The invention discloses a surface grinding device, and belongs to the field of workpiece grinding. The surface grinding device comprises a grinding sheet and a swing mechanism; the grinding sheet is fixedly arranged on the swing mechanism; the swing mechanism is driven by a drive device; the drive device drives the grinding sheet to swing through the swing mechanism; the swing mechanism comprises an eccentric shaft and a transmission element; a long circular hole is formed in one end of the transmission element; and the eccentric shaft rotates in the long circular hole to drive the transmission element to swing. The surface grinding device solves the grinding problem in a corn-shaped narrow area, further improves grinding efficiency, reduces breakage potential safety hazards of the grinding sheet and reduces cost of the grinding sheet.