The treatment capacity of the device is 800 m/h, and the combined process of "vacuum negative pressure collection + compression condensation + membrane separation" is adopted. After the volatile gas is collected through the closed pipeline, it is compressed and condensed, and most of the petroleum ether is liquefied and recovered; the low-concentration uncondensed tail gas enters the membrane separation unit, and the organic gas is preferentially enriched and refluxed through the membrane for cascade treatment, and the clean air is discharged up to the standard. The recovery rate can reach more than 95%, the emission concentration is far lower than the national emission limit, no solid waste, no waste liquid, no secondary pollution. Explosion-proof design of the device, PLC automatic control, skid-mounted integration, small footprint, low energy consumption, long service life of membrane components, simple operation and maintenance, suitable for solvent recovery and tail gas treatment of petroleum ether in pharmaceutical, chemical, coating and other industries.