Clay stabilizer for fracturing and preparation method thereof

The invention discloses a clay stabilizer for fracturing and a preparation method thereof. The preparation method comprises the following steps: firstly, sequentially adding an acrylamide monomer, an anionic monomer, a cationic monomer and distilled water into a reactor, stirring until the monomers are dissolved to obtain a mixed solution, then controlling the temperature of the mixed solution to be 30-40 DEG C, adjusting the pH value of the mixed solution to be 5-7 by using a NaOH solution, and carrying out ultrasonic dispersion, so as to obtain a gel; the preparation method comprises the following steps: firstly, preparing a monomer, then adjusting the water amount to enable the total monomer mass percentage concentration to be 20-30% so as to obtain a polymer solution, then introducing high-purity nitrogen into the polymer solution, slowly dropwise adding an initiator, dropwise adding a sulfydryl chitosan aqueous solution after the temperature of the solution is increased to 45-55 DEG C, reacting to obtain