Embodiments of this application provide a powertrain, a method for controlling cooling of the powertrain, and a vehicle. The powertrain includes a reservoir (101), configured to store coolant; a first drive motor (20), where the first drive motor includes a first stator (201) and a first rotor (202); a second drive motor (60), where the second drive motor includes a second stator (601) and a second rotor (602); a first pump (40) and a second pump (80), where an inlet of the first pump is connected to the reservoir, and an inlet of the second pump is connected to the reservoir; a heat exchanger (120), where the heat exchanger is connected to the first pump; a first flow path (50), where the first flow path is connected to an outlet of the first pump, and the first flow path is used to supply the coolant to the first stator and the second stator through the heat exchanger; and a second flow path (90), where the second flow path is connected to an outlet of the second pump, and the second flow path is used to supply the coolant to the first rotor and the second rotor. With embodiments of this application, cooling of the powertrain can be optimized, and component redundancy can be avoided.