The invention discloses a clutch device of a gear transmission system of a breaker spring operating mechanism. The clutch device comprises an energy storage shaft, a big gear and a small gear, wherein the big gear is provided with a deficiency tooth and a special tooth area at the position of the energy storage preserving position opposite to the small gear; a cavity of the inner part of the big gear in the area and part which is extended backwards is provided with a clutch cam driven to reset by a resetting spring; the big gear has a first special tooth, a second special tooth and a neutral gear between the first and second special teeth in the area; when the energy storage is finished, the small gear pushes the first special tooth to push the big gear and the energy storage shaft to the energy storage preserving position away from a friction dead zone, and then the small gear and the big gear are automatically disengaged. When the energy storage reaches to the energy storage preserving position, the small gear rotates inertially and randomly stops at any possible positions; when the quick-action switch-on drives the big gear to rotate, reliable and stable re-engagement between the big gear and the small gear can be realized; and the phenomena that the big and small gears are mutually stuck and the action of switch-on cannot be realized impossibly occur in any situations.