The invention provides an integrated on-line monitoring and controlling method and device for a sulfur hexafluoride switchgear. According to the technical scheme of the invention, a partial discharge on-line monitoring system, a sulfur hexafluoride gas pressure on-line monitoring system and a temperature on-line monitoring system are arranged in the sulfur hexafluoride switchgear. A temperature and current on-line monitoring system is arranged in a thermal insulation system. A weather on-line monitoring system is arranged outside the sulfur hexafluoride switchgear. Data are transmitted to a monitoring and control center via the on-line monitoring systems. The monitoring and control center judges whether to switch on the thermal insulation system or not, or decides whether to send out an alarm command or not through an internal procedure, so as to control the sulfur hexafluoride switchgear and the thermal insulation system and ensure the excellent operation of the sulfur hexafluoride switchgear. Based on the advanced on-line monitoring means, the sulfur hexafluoride switchgear and the thermal insulation system are monitored and controlled in the on-line manner. Therefore, the effectiveness, the reliability, the security and other performances of the sulfur hexafluoride switchgear in the extremely cold environment are greatly improved. Meanwhile, the service life of the sulfur hexafluoride switchgear is greatly prolonged.