The invention discloses an aero-engine accessory transmission structure. The aero-engine accessory transmission structure comprises a bearing mounting base, a bearing, a fixing shaft, a gear and a sealing part. The bearing mounting base is provided with a bearing base used for being fixedly connected with a transmission box, and a cavity which penetrates through the bearing base and is used for mounting of the bearing and the sealing part. The gear is located on the end face, close to the bearing, of the bearing mounting base. The fixing shaft sequentially penetrates through the sealing part, the bearing and the gear and fixes the sealing part and the gear to the two ends of the bearing mounting base correspondingly. According to the aero-engine accessory transmission structure, all aero-engine accessories are mounted on the transmission box through the bearing mounting base, mounting of the bearing and sealing between the transmission box and all the aero-engine accessories are both ensured, the sealing part and the gear are fixed to the two ends of the bearing mounting base correspondingly through the fixing shaft, and thus compact transmission structure design is achieved. The aero-engine accessory transmission structure provided by the invention is compact, convenient to mount and reliable in transmission.