A water-cooled motor may include a motor housing configured to be provided with a cooling water passage part in a circumferential direction and have one side surface provided with a radiation fin part, a stator configured to have a core wound with a coil along the cooling water passage part within the motor housing, and a rotor configured to have plates which each face a side of the stator and the radiation fin part and have one side provided with a turbulence generator in a direction of the radiation fin part side.