A heat dissipation structure of a fan drive of an air conditioner outdoor unit, and an air conditioner outdoor unit are provided. A side plate of the air conditioner outdoor unit is disposed between a side plate of the fan drive and a baffle plate, and the side plate of the air conditioner outdoor unit clings to the side plate of the fan drive; a first air vent communicating with the outside of the air conditioner outdoor unit is provided on the side plate of the air conditioner outdoor unit; and a second air vent is provided on the baffle plate, the first air vent and the second air vent form an air duct between the side plate of the air conditioner outdoor unit and the baffle plate, and the second air vent enables the first air vent to communicate with an inner chamber of the air conditioner outdoor unite.