The invention discloses a high-speed motor oil leakage prevention structure, and belongs to the technical field of motors. The high-speed motor oil leakage prevention structure comprises a rotating shaft extending forward and backward, wherein the rotating shaft is provided with a bearing, the bearing is installed in a bearing pedestal, the rear side of the bearing pedestal is provided with an oilleakage prevention assembly, the oil leakage prevention assembly comprises an air inlet pipe, a ventilation box and an annular ventilation sleeve arranged at the outer ring of the rotating shaft in asleeved manner, and the air inlet pipe, the ventilation box and the annular ventilation sleeve are sequentially communicated. The high-speed motor oil leakage prevention structure can prevent oil leakage of the bearing and save more maintenance cost in running of the motor.