Device and method for obtaining heavy carbon isotope methane

The invention provides a device and a method for obtaining heavy carbon isotope methane. The device comprises a gas supply unit, a separation unit, a vacuum treatment unit, a multi-temperature-level heating unit and a trapping unit, the gas supply unit comprises a gas supply high-pressure gas cylinder, a gas path and a pressure regulating valve and is used for providing a methane gas raw material for the separation unit, and the pressure regulating valve is arranged on the output gas path; the separation unit is connected with a gas path of the gas supply unit, receives a methane gas raw material provided by the gas supply unit and stably stores the methane gas raw material; the vacuum treatment unit is used for vacuumizing the separation unit before the gas supply unit supplies gas to the separation unit; the multi-temperature-level heating unit is used for stably heating the separation unit and promoting the discharge of the target carbon-13-enriched methane gas; the carbon-13-enriched methane gas discharge