Automatic removing mechanism for corrugated board printing unqualified products

The utility model discloses an automatic rejecting mechanism for corrugated board printing unqualified products, which comprises a conveying mechanism, a rejecting mechanism and a non-defective product discharging mechanism, the conveying mechanism is used for conveying paperboards, the rejecting mechanism is used for rejecting the non-defective paperboards in the conveying mechanism, and the non-defective product discharging mechanism is used for conveying the non-defective paperboards of the conveying mechanism; the conveying mechanism comprises a main machine frame, the removing mechanism is installed on the rear side of the main machine frame and comprises a removing conveying frame, the removing conveying frame is installed on the rear side of the main machine frame, and when a guiding air cylinder retracts backwards, a flow guiding plate rotates anticlockwise, so that defective paper boards are better guided by an inclined face after the flow guiding plate rotates, and the defective paper boards are rem