The invention discloses an operation mechanism of an indoor vacuum circuit breaker. The operation mechanism comprises a power source, an energy storage driving mechanism, an energy storage mechanism, a closing driving mechanism and an opening driving mechanism. According to the invention, shafts of manual energy storage and electric energy storage are integrated onto a motor to form an output shaft, and closing keeping and energy storage keeping are integrated into a mechanism module, so that the quantity of spare parts of the mechanism is greatly reduced, and the size is reduced; partial function units are integrated, so that the layout of the mechanism is simpler and more compact; and the layout is reasonably changed, so that the misoperation probability is reduced, the working reliability is improved, the required maintenance times are reduced, the required maintenance cycle is prolonged, and a purpose of lowering the maintenance cost is achieved.