An improved generator for using waterpower, wave-power or wind-power, comprising; a set of magnet plates and coil plates for mounting on a rotating shaft in parallel, the magnets installed on the magnet plates and the generating coils installed on the coil plates with constant-intervals in radial direction, a plurality of blades obliquely installed on circumference of the magnet plates and coil plates with mutually opposite direction, an inner annular cylinder and outer annular cylinder mounted on the coil plates to form annular container for inserting the magnets. A plurality of induction coils installed on the inner annular cylinder, a plurality of electromotive coils installed on the outer annular cylinder for proximately contact with ends of the magnets. The magnet plates and coil plates rotate in mutually opposite direction to enhance the quality of generation and repulsive force. Thus, the rotational reaction force is continuously generated between the magnets and coil plates to enhance the rotational force.