The present invention provides a transmission high-voltage connector for circuit connection of a transmission of a new-energy vehicle, the transmission comprising a box body and a high-voltage connector covering an opening of the box body, the high-voltage connector comprises a housing, at least one reinforcing sheet and a copper bar, and the copper bar is inserted into and connected to the housing; wherein, the housing is an N-sided polygon, and at most N-1 fixing holes are formed in the housing at positions where two side lines are connected; and at positions where two side lines are connected while no fixing hole is formed, the housing embraces and is connected to the reinforcing sheet. The transmission high-voltage connector provided by the present invention is simple in structure, and has enhanced strength and high-temperature deformation resistance.