The invention discloses an energy-feed type mechanical protection tool applied to a backpack. The mechanical protection tool is composed of a protection waistband tightly attached to the human body and a mechanical energy-feed vibration reducing device arranged in the middle of the waistband. The energy-feed vibration reducing device can be used for converting vibration mechanical energy of the human body relative to the backpack in the load-bearing moving process into electric energy and storing the electric energy. Meanwhile, part of pressure, exerted on the shoulders of the human body, of the backpack can be decomposed to the waist part, and therefore the mechanical relation between the backpack and the human body is improved. The energy-feed vibration reducing device is composed of a spring, a mechanical transmission mechanism, a power generation mechanism and the like. Damping force needed by a system is mainly provided by reverse electromotive force generated during work of a power generator, and active control over the dynamics relation between the human body and the backpack can be achieved by adjusting the work state of the power generator. The electric energy collected by the system can be used for key energy needed by loads such as illumination and wireless communication. The mechanical protection tool has the beneficial effects of being small in size, small in weight, convenient to wear and the like and is suitable for various types of backpacks.