A magnetic path closed electric generator includes a base (9), a housing (8), a stator (3), a rotator (5), a rotation shaft (7) and a transmission wheel. A magnetic permeability neck (12) is fixed on the stator; a coil winding (2) on the stator is fixed on the magnetic permeability bracket (1) and hitches outside a magnetic permeability neck; a low magnetic permeability medium (13) is disposed between the magnetic permeability bracket and the magnetic permeability neck. When the rotator rotates, a magnetic body (4) rotates along with it. The magnetic permeability neck is inducted to permeate magnetic and generate electric current with change of flux passing through the coil winding. A magnetic field generated by the electric current in the coil winding passes through the magnetic permeability bracket. The coil winding on the stator and the magnetic body on the rotator form a magnetic line closed loop in their own magnetic field. There is only small magnetic attracting force between the rotator and the stator.