The invention discloses a turbine set transmissionsystem which comprises a base, a gearbox, an input end coupling and an output end coupling, wherein the gearbox is arranged on the base; the gearbox comprises a box body, an input shaft and an output shaft; the input shaft and the output shaft are arranged in the box body in parallel; an input shaft gear and an output shaft gear are respectively fixed in one section inside the box body, of the input shaft and the output shaft; the input shaft gear and the output shaft gear are meshed together; the outer ends of the input shaft and the output shaft are respectively arranged on two sides of the box body and are respectively connected with the input end coupling and the output end coupling; the input end coupling is connected with a gas turbine; the output end coupling is connected with a power generator. Due to the adoption of the turbine set transmissionsystem, the interchange property of a Dongfang terminal set and a Weizhou terminal set can be improved, the overhaul periods can be reduced, and the overhaul expense of later sets can be reduced.