The invention relates to an oil cooling electric vehicle controller. The oil cooling electric vehicle controller is characterized in that seal structures are arranged among housings and among housings and all interfaces, a power wiring terminal not only achieves the function of connecting a control circuit board with a power source and a motor, but also simultaneously achieves the function of fixing the control circuit board, the housings are filled with cooling oil, an oil cooling mode is used for heat dissipation, and therefore heat dissipation efficiency of the oil cooling electric vehicle controller is greatly improved. The oil cooling electric vehicle controller has the advantages of being reasonable in setting, compact in structure, convenient to connect and use, and safe and reliable.