Paper box folding device

The utility model is applicable to the technical field of folding devices, and provides a paper box folding device which comprises a shell used for folding a paper box and containing the paper box, the shell is of a hollow structure with an opening in the top, an ejection device used for automatically ejecting out the paper box is arranged in the shell, and when the paper box is folded, force is applied to enable the paper box to be folded and then placed in an inner cavity of the shell. And after the force is removed, the ejection device ejects the folded paper box out of the inner cavity of the shell. The folded paper box can be automatically ejected out of the inner cavity of the shell through the ejection device, the folded paper box does not need to be manually taken, and time and labor are saved; the lifting plate is driven to move upwards through resilience force of the compressed spring, so that the folded paper box on the lifting plate can be ejected out of the shell, and the folded paper box can be