Water-cooled motor and electric control system are built with water pipes. The coolant flows through the motor and electric control device to take away heat, and enters the radiator of the water tank to dissipate heat. The electric fan and radiator are integrated and installed to accelerate heat dissipation. The ECU network room controller monitors the coolant temperature in real time through the temperature sensor distributed in the water tank inlet and outlet, and synchronously and intelligently adjusts the operation status of the cooling fan (starting, low speed, stepless change, and high-speed cooling liquid passing through the heat dissipation under the action of the brushless magnetic water pump, and then enters the drive motor and the electric control device to take away the heat, so as to ensure that the drive motor always works in the optimal temperature range