The invention discloses a mini gearbox driving method. The method is characterized by comprising the following steps that 1, a power output shaft gear is equipped; 2, a transmission gear set connected with the power output shaft gear is equipped, and the transmission gear set comprises a long gear, a chain winding jumping gear and a chain releasing jumping gear; 3, an energy storage gear set connected with the transmission gear set is equipped, and the energy storage gear set comprises a large gear and a chain arranged below the large gear; 4, energy storage of the chain is conducted, wherein the power output shaft gear drives the long gear to rotate, the long gear drives the chain winding jumping gear to rotate and move towards the large gear, therefore, the large gear is driven to rotate, and the chain arranged below the large gear is driven by the large gear to be tightened for energy storage; 5, energy release is conducted, wherein after energy storage in the fourth step is over, the chain releases energy to drive the large gear to rotate, and then the large gear drives the chain releasing jumping gear to rotate and move towards the long gear, therefore, the long gear is driven to rotate, that is to say, the output shaft gear can be driven to rotate to complete driving.