An energy-saving generator set includes a generator having a battery provided therein for starting the generator; a mechanical energy generating mechanism provided inside the generator to generate high-voltage power supply via a split magnetic coil thereof; a distribution board provided on the generator for dividing the generated high-voltage power supply into three parts, which are separately supplied to the mechanical energy generating mechanism, the battery, and an external electrical appliance via an output interface on the generator; and a control switch for controlling the starting of the mechanical energy generating mechanism and the leading of the generated high-voltage power supply to the output interface when the battery has been fully charged.