Control method and device for air conditioner to automatically recognize and stop running and air conditioner

The invention provides a control method and device for an air conditioner to automatically recognize and stop running and the air conditioner, and the method comprises the steps that if the air conditioner is started in a first time period and continuously runs to the moment when a user leaves home, a reminding signal is output after the air conditioner continuously runs for a first duration; if the command for confirming continuous operation is not received, entering an energy-saving mode for operation; after running in the energy-saving mode for a second duration, outputting a reminding signal and/or detecting whether a human body moves in the room; if the command for confirming continuous operation is not received and/or no human body moves in the room is detected, entering a ventilation mode for operation; and if detecting that the human body moves in the room, continuing to operate in the energy-saving mode. The user can be actively prompted to turn off the air conditioner, and the air conditioner enters