Oil pump device and vehicle

The embodiment of the invention provides an oil pump device and a vehicle, and the oil pump device comprises a motor structure which comprises a driving shaft; the pump structure comprises a pump shell and a pump rotor arranged on the pump shell; the pump rotor specifically comprises a first rotor structure and a second rotor structure which are meshed with each other, and the first rotor structure is connected with the driving shaft; the end, away from the motor structure, of the first rotor structure is provided with a groove part sunken towards the motor structure, the pump cover is provided with a first cover protruding part matched with the groove part, the first cover protruding part extends into the groove part, the first rotor structure is provided with a first shaft hole in a through hole shape, the pump cover is provided with a second shaft hole, and the driving shaft penetrates through the first shaft hole and extends into the second shaft hole. The driving shaft and the second shaft hole form a fr