The utility model discloses an SF6 decomposition product detection test device and a tail gas recovery device thereof. The tail gas recovery device for the SF6 decomposition product detection test comprises a conveying pipeline, an inlet of the conveying pipeline is communicated with an outlet of a sample pool, the sample pool is used for containing SF6 gas, and the SF6 gas can react in the samplepool to generate tail gas; an inlet of the tail gas recovery bottle is communicated with an outlet of the conveying pipeline; and the switch valve is arranged on the conveying pipeline and is used for controlling the connection and disconnection of the tail gas recovery bottle and the sample pool. When the SF6 gas in the sample pool reacts, the switch valve is closed; after the reaction of the SF6 gas in the sample pool is finished, the switch valve is opened, and the tail gas in the sample pool is collected into the tail gas recovery bottle along the conveying pipeline, so that the tail gasis prevented from being directly discharged into the atmosphere to pollute the air and injure experimenters.