The invention belongs to the technical field of renewable energy sources and micro-miniature power generation, and particularly relates to a two-degree-of-freedom electromagnetic energy harvester forconverting vibration and linear reciprocating motion into rotary motion. The device is characterized in that the device at least comprises a base, a rotor, a top cover, a spring, a rope, magnets, a coil, a radial bearing and ferromagnetic patches; the radial bearing is fixedly connected with a cylindrical shaft; the rotor is fixedly connected with the outer ring of the radial bearing; the two endsof the spring are fixedly connected with the top cover and the base respectively to support the top cover to move up and down; the plurality of groups of magnets are fixed to the rotor; and the two ferromagnetic patches are fixed on the outer cylindrical surface of a cylinder. When external excitation acts on the top cover, the rope drives the rotor to rotate, the magnets fixed to the rotor and the coil move relative to each other, and electric energy is continuously output through the electromagnetic induction principle. The energy harvester has the characteristics of being high in output power, wide in working frequency band, free of influence of the placing direction, wide in application range and the like.