Pipeline natural gas recovery system coupled with compressor and ejector

The utility model discloses a pipeline natural gas recovery system coupled with a compressor and an ejector, which comprises a high-pressure main pipeline, a low-pressure main pipeline, a branch pipeline, a throttle valve, a separator, the compressor and the ejector, and is mainly applied to a natural gas collection station for recovering natural gas needing to be emptied. A throttling valve is arranged on a high-pressure natural gas pipeline and a low-pressure natural gas pipeline and connected with an inlet of a separator, an outlet of the separator is connected with a compressor for pressurizing and transporting natural gas, a high-pressure gas branch of an outlet of the compressor is connected with a high-pressure inlet of an ejector, and branches of the high-pressure natural gas pipeline and the low-pressure natural gas pipeline are connected with a low-pressure inlet of the ejector after passing through the throttling valve. Natural gas at an outlet of the ejector converges into the separator; according