Anaerobic state simulation device for sewage treatment

The utility model provides an anoxic state simulation device for sewage treatment, which comprises: a reaction chamber containing sewage; the dissolved oxygen probe extends into the sewage to obtain dissolved oxygen of the sewage; a first opening of the three-way air pump is in one-way communication with the reaction chamber through a gas conveying pipeline, a second opening of the three-way air pump is in one-way communication with a nitrogen source, a third opening of the three-way air pump is in one-way communication with an oxygen source, and the gas conveying pipeline conveys mixed gas of nitrogen and oxygen; the control system is connected with the dissolved oxygen probe through a signal line, connected with the nitrogen source through a first control line and connected with the oxygen source through a second control line; and the pressure release valve penetrates through the inner wall of the reaction chamber and exhausts gas in the reaction chamber. According to the invention, the dissolved oxygen in