Abstract: A power generator using batteries to drive the generator to rotate for power generation, and using the generated power to recharge the batteries is provided. The power generator includes a battery set to provide power to rotate a starting motor. The starting motor is connected to a first link device, which is connected to a first generator. The rotation of the starting motor enables, through the first link device, the rotation of the first generator to generate power for other electrical devices. The first generator, through a second link device, enables a second generator to rotate and generates power when the first generator is in operation. The power generated by the second generator recharges the battery set so that the power generation efficiency is improved.