Closing method of carbon dioxide electro-catalytic reactor

The invention relates to the technical field of energy, and discloses a closing method of a carbon dioxide electro-catalytic reactor, which comprises the following steps: step 1, starting a reduction circuit to carry out reduction impurity removal treatment; 2, a cleaning circuit is started for cleaning treatment; 3, carbon dioxide gas is injected into the cathode chamber, electrolyte is injected into the anode chamber, and the cathode chamber and the anode chamber are sealed and stored; the reduction circuit adopts three-section voltage treatment, and the first-section voltage treatment can oxidize metal impurities on an electrode catalyst of the cathode into corresponding metal oxides; salt crystals are converted into carbon monoxide and carbon dioxide through second-section voltage treatment, salt ions are transferred into anolyte at the same time, and metal oxides on the surface of a cathode are all reduced into elementary metal through third-section voltage treatment to achieve electrode updating; the cl