The invention discloses a printed product inspecting machine capable of preventing excessive deformation of paper. The printed product inspecting machine comprises a device main body; the front end ofthe middle part of the device main body is provided with a printed product feeding mechanism; the printed product feeding mechanism is fixedly connected with the device main body; a clamping plate isarranged at the right end of the device main body and is fixedly connected with the device main body; a transmission device is arranged at the lower end of the clamping plate and is closely connectedwith the clamping plate; the printed product feeding mechanism in the printed product inspecting machine is a reeling type, so the paper can be naturally and smoothly spread; subsequently, the papercan be stably conveyed by virtue of a printed product conveying rail which is arranged on the printed product feeding mechanism; a fan is used for blowing and washing the surface of the paper so thatthe surface of the paper is relatively clean; finally when the paper passes through a light source box, a roll shaft positioned at the front end of the light source box can be used for further flattening the paper, so the effect of preventing excessive deformation of the paper is achieved.