An oil pump motor, a gearbox and a vehicle are provided; the oil pump motor comprises the following units: a housing with an oil inlet and an oil outlet; a motor and an oil pump arranged in the housing, wherein the motor is used for driving the oil pump, the oil pump is provided with an oil inlet chamber and an oil outlet chamber mutually connected, and the oil outlet chamber is connected with theoil outlet; a cooling channel arranged in the housing and outside the motor and the oil pump, the cooling channel pipe wall makes contacts with the motor and the oil pump, the cooling channel has aninlet and an outlet, the inlet is connected with the oil inlet, and the outlet is connected with the oil inlet chamber. The gearbox oil liquid circulates in the oil pump motor and flows in the coolingchannel; the cooling channel pipe wall makes contacts with the motor and the oil pump, so the gearbox oil liquid in the cooling channel can cool down the motor and the oil pump, thus providing idealcooling and heat radiation effects without immersing the oil pump motor in the gearbox oil liquid.