Constant-temperature negative-pressure dynamic headspace oil-gas separation device and method

The invention relates to the field of oil-gas separation, in particular to a constant-temperature negative-pressure dynamic headspace oil-gas separation device and method. The constant-temperature negative-pressure dynamic headspace oil-gas separation device comprises a gas inlet pipe, an exhaust pipe, an oil inlet pipe, an oil outlet pipe, an oil mist filtering device and an optical gas chamber. The air inlet pipe is communicated with the oil mist filtering device through a first pipeline and a second pipeline, an air inlet valve is arranged on the first pipeline, and an oil discharging valve is arranged on the second pipeline. The exhaust pipe is communicated with the optical air chamber, an exhaust valve and an air pump are respectively arranged on the exhaust pipe, the oil inlet pipe is respectively communicated with the oil outlet pipe and the third pipeline, an oil inlet valve is arranged on the oil inlet pipe, an oil outlet valve is arranged on the oil outlet pipe, the third pipeline is communicated wi