Provided is a slip sheet folding machine capable of efficiently folding a large number of corrugated board sheets to form a slip sheet, and capable of stably securing a bending angle that is a necessary condition for the slip sheet. A corrugated board sheet processing apparatus comprising: Conveying means for conveying a corrugated board sheet processed for a slip sheet; and folding means for folding a leading end of the corrugated board sheet conveyed by the conveying means to form a slip sheet, whereby the corrugated board sheet can be folded without stopping, A large number of corrugated board sheets can be efficiently folded to form a slip sheet. Further, the bending angle, which is the required condition of the slip sheet, can be stably secured. Figure 3

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