CO ratio control system of acetic acid or propionic acid device

The invention discloses a CO ratio control system of an acetic acid or propionic acid device, and relates to the technical field of acetic acid or propionic acid production. The device specifically comprises a pressure regulator, a main regulator, an auxiliary regulator and a selector, the output end of the main regulator is electrically connected with the auxiliary regulator, the flow meter is also electrically connected with the auxiliary regulator, and the CO analyzer is electrically connected with the selector and the main regulator. The selector is electrically connected with the flow regulating valve and the pressure regulator, the selector controls the opening degree of the flow regulating valve according to the CO content detected by the CO analyzer, and the selector controls the opening degree of the pressure regulating valve through the pressure transmitter. The selector controls tail gas emission and CO inlet gas according to the CO content detected by the CO analyzer, and the CO content and pressu