Cutting protection device for printing machinery and use method of cutting protection device

The invention discloses a cutting protection device for printing machinery and a using method of the cutting protection device, and relates to the technical field of printed matter cutting, and the cutting protection device for the printing machinery comprises a workbench. In the using process, after a printed product is fixed, the cutter is moved to a proper position under the action of the first moving assembly, the hydraulic cylinder is started to drive the cutter and the protection plate to synchronously move downwards, when the protection plate moves to the bottom, the multiple inductors conduct induction, and when the multiple inductors synchronously induct an object, normal work continues; at the moment, the cutting knife continues to move downwards to cut a printed product, when the cutting knife moves, a protection plate can be kept relatively static under the action of two sliding shafts, when a concave mounting plate moves upwards, the protection plate is driven to reset under the action of gravity