The utility model belongs to gear box structure technical field, specifically is a kind of high -efficient transmission gear box structure, including shell;The top of shell is provided with multiple limit slots;The inside of each limit slot is embedded with bearing;The bearing between the left two limit slots is connected with main rotary lever, and first drive gear is fixedly connected on main rotary lever;The bearing between the right two limit slots is connected with auxiliary rotary lever, and second drive gear is fixedly connected on auxiliary rotary lever;The bearing between the two limit slots between main rotary lever and auxiliary rotary lever is connected with transmission rod;First transmission gear and second transmission gear are fixedly connected on the lateral wall of transmission rod, and first transmission gear is engaged with first drive gear, and second transmission gear is engaged with second drive gear.The utility model drives drive gear by connecting main rotary lever, and the cooperation of transmission rod and transmission gear, can drive auxiliary rotary lever to rotate, effectively improves transmission efficiency.