Responsive modifying and flooding agent and preparation method thereof

The invention relates to a response type modifying and flooding agent with a structural formula shown in the specification, wherein m and n are integers, m is equal to 2-8, and n is equal to 2-8. The preparation method of the response type modifying and flooding agent comprises the following steps: (1) preparing an N-(hydroxymethyl) acrylamide aqueous solution, heating, adding monomethylamine, then adding methyl acrylate, continuously stirring, and cooling to obtain an intermediate product; (2) preparing an acrylamide aqueous solution, uniformly stirring and adding the acrylamide aqueous solution into the intermediate product to obtain a monomer mixed solution; (3) respectively preparing an oxidizing agent aqueous solution, a reducing agent aqueous solution and an auxiliary agent aqueous solution with the mass concentration of 0.02-20%; and (4) feeding the monomer mixed solution into a reaction kettle, introducing nitrogen, cooling to 0-15 DEG C, 0.5-2 hours later, sequentially adding the oxidant aqueous solu