Conveying method and device capable of preventing conveyor belt from being damaged

The invention discloses a conveying method and device capable of preventing a conveyor belt from being damaged. A main electromagnet is arranged above the belt of a belt conveyor, is in a constant power supply state and is used for adsorbing ferromagnetic sundries in materials conveyed by the belt conveyor; and auxiliary electromagnets are arranged around the main electromagnet and are in a normal state when being powered off. Four infrared monitoring assemblies are arranged on the belt conveyor and used for monitoring rod-shaped ferromagnetic sundries appearing in the front, back, left and right directions of the periphery of the main electromagnet, if the infrared monitoring assembly in one direction monitors the rod-shaped ferromagnetic sundries, a control signal is output, and the auxiliary electromagnet correspondingly controlled by the infrared monitoring assembly is powered on; the auxiliary electromagnet attracts rod-shaped ferromagnetic sundries on the auxiliary electromagnet, so that the situation t