Human body detection method and device, air conditioner and control method of air conditioner

The invention provides a human body detection method and device, an air conditioner and a control method thereof, and relates to the field of air conditioners. The human body detection method comprises the steps that an infrared sensor detects the indoor space temperature and obtains thermal image data; obtaining a temperature matrix corresponding to the region matrix according to the thermal image data; determining room temperature according to the temperature matrix, calculating the temperature difference between the temperature matrix and the room temperature, and obtaining a temperature difference matrix; determining a human body extraction temperature threshold value according to the room temperature and the relation curve of the human body temperature and the room temperature; according to the temperature difference matrix and the human body extraction temperature threshold value, determining the area range with the temperature difference exceeding the human body extraction temperature threshold value a