A motor cooling structure, a drive assembly and a vehicle. The motor cooling structure includes: branch flow-channels (100), shell flow-channels (200), end cover flow-channels (300), a liquid inlet (201) and a liquid outlet (202). A plurality of the branch flow-channels (100) are circumferentially arranged on a stator (1) of a motor around an axis of the motor. The shell flow-channels (200) includes a liquid inlet flow-channel (211), shell long flow-channels and a liquid outlet flow-channel (212). The liquid inlet flow-channel (211), the plurality of shell long flow-channels and the liquid outlet flow-channel (212) are circumferentially arranged on a reducer shell (2) around the axis of the motor. The end cover flow-channels (300) includes end-cover long flow-channels, and a plurality of the end-cover long flow-channels are circumferentially arranged on a motor end cover (3) around the axis of the motor. The shell flow-channels (200), the plurality of branch flow-channels (100) and the end cover flow-channels (300) form a continuous total flow-channel. The liquid inlet (201) is disposed on the reducer shell (2), and is in communication with the liquid inlet flow-channel (211). The liquid outlet (202) is disposed on the reducer shell (2), and is in communication with the liquid outlet flow-channel (212). The motor cooling structure realizes immersion cooling of the motor and improves the cooling efficiency of the motor.