NOVELTY - Production of zwitterionic polyvinyl butyral resin involves: 1) preparing water solution of polyvinyl alcohol (PVA) (100 g) using solvent and catalyst; adding aqueous hydroxide sodium or potassium hydroxide (5-15 wt.%) to adjust PH value of polyvinyl alcohol to 9-11; adding N,N-dihydroxy alkyl acrylamide (0.045 -0.09 mol), reacting for 3-8 hours at 50-80 degrees C, 2) adding sodium chloroacetate with water and N, N-hydroxyalkyl acrylamide, reacting for 30-60 minutes in the step (1) according to 50-80 degrees C, 3) reacting modified PVA water solution with butyraldehyde acetal under acidic condition.    USE - For production of zwitterionic polyvinyl butyral resin (claimed) as vehicle windshield, building safety glass interlayer material, ceramic pattern, adhesive, in textile sizing, production field of the solar battery, photovoltaic battery.    ADVANTAGE - Because the two ionic groups are alkyl ether of ethylene bond with the polymer chain alcohol units connected with the side chain a C-O-C key chain can move along the axial direction, the flexibility of the film is not influenced, the membrane's tensile strength and shock resistance; the film transparency, haze can satisfy the requirements of the application.    DETAILED DESCRIPTION - Production of zwitterionic polyvinyl butyral resin involves: 1) preparing water solution of polyvinyl alcohol (PVA) (100 g) using solvent and catalyst; adding aqueous hydroxide sodium or potassium hydroxide (5-15 wt.%) to adjust the PH value of the polyvinyl alcohol (PVA) to 9-11; adding N, N-dihydroxy alkyl acrylamide (0.045 -0.09 mol), reacting for 3-8 hours at 50-80 degrees C, 2) adding system molar amount of sodium chloroacetate with water and N, N-hydroxyalkyl acrylamide, reacting for 30-60 minutes in the step (1) according to 50-80 degrees C, 3) reacting the modified PVA water solution with a butyraldehyde acetal under the acidic condition, where the current water phase acetal reaction process of the polyvinyl alcohol and butyraldehyde are used, or adding alcohol solvent, separating out the modified PVA solid, then filtering, drying, and reducing alcohol degree of the product to 65-85%.