The present invention relates to a high-voltage circuit breaker high-power spring operating mechanism. A switching-off energy storage spring system and a switching-on energy storage spring system which are parallel to each other in a vertical direction are arranged between a left wall plate and a right wall plate; the switching-off energy storage spring system is connected with a piston rod for output operation; an energy storage transmission system is distributed on the outer walls of the left wall plate and the right wall plate; the main shaft of the energy storage transmission system passes a space between the two wall plates; the main shaft of the energy storage transmission system is connected with the switching-on energy storage spring system at the right wall plate so as to provide switching-on energy storage operation and provides switching-off energy storage operation for the switching-off energy storage spring system at the left wall plate in a hook surface sliding contact manner; a switching-off pulling sub-system is arranged at the outer wall of the right wall plate; an switching-on pulling sub-system is arranged at the outer wall of the right wall plate; an output shaft system is arranged at the inner sides and two outer walls of the left wall plate and the right plate wall and is connected with the energy storage transmission system, the switching-off energy storage spring system and the switching-on energy storage spring system; and the main shaft of the output shaft system passes through the space between the two wall plates and is of a sleeved type half shaft structure and can be in linkage with the switching-off energy storage spring system and the switching-on energy storage spring system.