A microfluidic device for the concentration and lysis of cells or viruses and a method of concentrating and lysing cells or viruses using the microfluidic device include: magnetic beads, a reaction chamber in which the magnetic beads are accommodated and a laser source. The reaction chamber includes a plurality of electrodes which cross each other and are separated by a dielectric to generate an electric field and a vibrating part agitating the magnetic beads in the chamber. The laser source radiates a laser onto the magnetic beads in the reaction chamber.