Anaerobic bacteria liquid amplification culture switching device

The utility model discloses an anaerobic bacteria liquid amplification culture switching device, which belongs to the technical field of anaerobic fermentation and comprises a culture bottle, the opening end of the culture bottle is in threaded connection with a two-way cover, the lower end of the two-way cover is communicated with a two-way device, the upper end of one through hole of the two-way cover is communicated with a first hose, and the upper end of the other through hole of the two-way cover is communicated with a second hose. A first hose is arranged on one through hole of the two-way cover, a first valve is arranged on the first hose, the upper end of the first hose is communicated with an air filter head connected with a connector of a nitrogen tank, a second hose is communicated with the upper end of the other through hole of the two-way cover, a second valve is arranged on the second hose, and a sample receiving head connected with a sample inlet in the top of the fermentation tank is communica