An electricity generation device, characterized in that the electricity generation device comprises: an operating module having; a body having an inner circumferential surface; a generator stator mounted on the inner circumferential surface of the body; a flywheel mounted in the body and having an extension portion, wherein an end of the extension portion extends out of the body; and a disk mounted in the body and having an outer peripheral surface spaced from the generator stator; and a through recess axially formed in a center of the disk; a generator rotor mounted around the outer peripheral surface and spaced from the generator stator; and a transmission assembly mounted in the through recess of the flywheel, mounted through the body, and having a unidirectional bearing mounted in the through recess of the flywheel and located in the disk; a connecting shaft mounted in the unidirectional bearing and the extension portion of the flywheel; a transmission shaft mounted in the body and axially spaced from the connecting shaft; and a clutch mounted on the connecting shaft and the transmission shaft and having a first half portion mounted on and around the connecting shaft; a second half portion mounted on and around a first end of the transmission shaft; and an adjustment block mounted on the transmission shaft and being movable in an axial direction of the transmission shaft; a first motor fixed with the transmission shaft of the transmission assembly of the operating module; and a second motor fixed with the extension portion of the flywheel. an operating module having; a body having an inner circumferential surface; a generator stator mounted on the inner circumferential surface of the body; a flywheel mounted in the body and having an extension portion, wherein an end of the extension portion extends out of the body; and a disk mounted in the body and having an outer peripheral surface spaced from the generator stator; and a through recess axially formed in a center of the disk; a generator rotor mounted around the outer peripheral surface and spaced from the generator stator; and a transmission assembly mounted in the through recess of the flywheel, mounted through the body, and having a unidirectional bearing mounted in the through recess of the flywheel and located in the disk; a connecting shaft mounted in the unidirectional bearing and the extension portion of the flywheel; a transmission shaft mounted in the body and axially spaced from the connecting shaft; and a clutch mounted on the connecting shaft and the transmission shaft and having a first half portion mounted on and around the connecting shaft; a second half portion mounted on and around a first end of the transmission shaft; and an adjustment block mounted on the transmission shaft and being movable in an axial direction of the transmission shaft; a body having an inner circumferential surface; a generator stator mounted on the inner circumferential surface of the body; a flywheel mounted in the body and having an extension portion, wherein an end of the extension portion extends out of the body; and a disk mounted in the body and having an outer peripheral surface spaced from the generator stator; and a through recess axially formed in a center of the disk; an outer peripheral surface spaced from the generator stator; and a through recess axially formed in a center of the disk; a generator rotor mounted around the outer peripheral surface and spaced from the generator stator; and a transmission assembly mounted in the through recess of the flywheel, mounted through the body, and having a unidirectional bearing mounted in the through recess of the flywheel and located in the disk; a connecting shaft mounted in the unidirectional bearing and the extension portion of the flywheel; a transmission shaft mounted in the body and axially spaced from the connecting shaft; and a clutch mounted on the connecting shaft and the transmission shaft and having a first half portion mounted on and around the connecting shaft; a second half portion mounted on and around a first end of the transmission shaft; and an adjustment block mounted on the transmission shaft and being movable in an axial direction of the transmission shaft; a first half portion mounted on and around the connecting shaft; a second half portion mounted on and around a first end of the transmission shaft; and an adjustment block mounted on the transmission shaft and being movable in an axial direction of the transmission shaft; a first motor fixed with the transmission shaft of the transmission assembly of the operating module; and a second motor fixed with the extension portion of the flywheel.