Pipeline control device of SF6 density relay

The utility model relates to a pipeline control device of an SF6 density relay. The device includes the SF6 density relay, a valve device, a multipass body, windpipes, joints and fixing seats. A plurality of windpipe connection holes, the inner parts of which are in mutual communication, are arranged on the multipass body. Two screw holes are arranged at the two sides of each windpipe connection hole, wherein one windpipe connection hole is fastened with the SF6 density relay through a bolt and a screw, other windpipe connection holes in the multipass body are each connected with a windpipe through a bolt and a screw, and a joint used for connecting another pipe is arranged on each windpipe. In the pipeline control device of the SF6 density delay, through adding of the multipass body between an original high-pressure windpipe pipeline and the SF6 density relay, it can be realized that in a condition that windpipe pipelines are not damaged, verification and maintenance replacement of the SF6 density relay are carried out so that airtightness of the windpipe pipelines is ensured and device maintenance and repairing cost is reduced.