Anti-settling polymerization inhibitor for diesel tail gas treatment fluid and production process of anti-settling polymerization inhibitor

The invention discloses an anti-settling polymerization inhibitor for diesel tail gas treatment fluid and a production process thereof, and the process comprises the following steps: preparing a component A of the anti-settling polymerization inhibitor: adding methylnaphthalene into a first reaction kettle, and sulfonating to obtain a sulfonated product; dropwise adding formaldehyde into the first reaction kettle to obtain a condensation product; and neutralizing the condensation product to obtain the component A of the anti-settling polymerization inhibitor. Preparing a component B of the anti-settling polymerization inhibitor: adding ethylenediamine and sodium hydroxide into a second reaction kettle, and uniformly mixing; dropwise adding a sodium cyanide solution and a formaldehyde solution to obtain a first product; adding sulfuric acid into the second reaction kettle for acidification to obtain a second product; and sequentially carrying out cooling crystallization, water washing and drying on the second