The invention relates to the technical field of power switchgears, and particularly relates to an environment-friendly gas insulating ring main unit. Aiming at the problem that sulfur hexafluoride gas in the existing sulfur hexafluoride gas insulating ring main unit destroys the environment, environment-friendly gas such as dry air, nitrogen and the like is adopted as an insulating material to develop the environment-friendly gas insulating ring main unit. According to the main technical measures, a circuit breaker adopts a vacuum arc extinguishing technology, an isolating switch adopts a double-fracture structure, and the electric field distribution of a conductive member is optimized by adopting voltage sharing technology. The safety of operators is ensured by adding an observation window, humidity display test paper and the like. The environment-friendly gas insulating ring main unit has the advantages that the ring main unit is environment-friendly and safe in the absence of sulfur hexafluoride gas (SF6); by adopting multiple composite insulating technologies, the insulating capability of the ring main unit is improved, and insufficient insulating capability of environment-friendly gas is overcome.