Insulating gas rapid charging and supplementing device

The invention relates to a rapid filling and supplementing device for insulating gas. A first gas circuit comprises an SF6 gas steel cylinder, a first pressure reducing valve, a first heat exchanger and a first fuzzy temperature control module which are sequentially connected in series; the downstream of the first fuzzy temperature control module is connected with a flow control branch and a proportional control branch in parallel; the second gas path comprises an N2 gas steel cylinder, a second pressure reducing valve, a second heat exchanger and a second fuzzy temperature control module which are sequentially connected in series; the downstream of the second fuzzy temperature control module is connected with a flow control branch and a proportional control branch in parallel; according to the invention, the pipelines for conveying SF6 and N2 gas are communicated in parallel, and the working mode that the pipelines are directly filled firstly and then the mass flow controller supplements gas is adopted in th