Sulfur hexafluoride recovery device

The invention discloses a sulfur hexafluoride recovery device which comprises air extracting devices, a driving assembly and two storage tanks, each storage tank is provided with one air extracting device, the two air extracting devices are located on the two opposite sides of the driving assembly respectively, the driving assembly comprises a driving part and a crankshaft connected with the driving part, and each air extracting device comprises a piston cylinder assembly and an air inlet pipe. The piston cylinder assembly comprises a cylinder body, a movably-arranged piston and a connecting rod, the cylinder body is provided with an opening communicated with the interior of the cylinder body, one end of the connecting rod is connected with the piston, the other end of the connecting rod penetrates through the opening to be rotationally connected with the crankshaft, the cylinder body is provided with a first air inlet and a first air outlet, and the first air outlet is communicated with the storage tank thro