The invention concerns a self-propelled lawn mower and a method adapted for using said machine. The machine comprises: a mobile frame (1) including at least one drive wheel (6) and at its lower surface at least two juxtaposed cutters (3), associated each with an electric motor; an electronic system for controlling the forward movement of the machine; an on-board computer; an electric power supply; means for measuring the force supplied by each cutter, said measurement being transmitted to the on-board computer; a memorized algorithm for seeking the grass surfaces to be mowed by the interaction of the machine forward movement system, said force measurements and the on-board computer; means for detecting the limits of the surface to be mowed by a magnetic field measurement or the variation of a magnetic field emitted or caused by a set or buried wire, located at said limits.