Method for preparing high-performance composite nanofiltration membrane with assistance of micro-nano foaming technology

The invention discloses a method for preparing a high-performance composite nanofiltration membrane with the assistance of a micro-nano foaming technology. The method comprises the following steps: step 1, preparing a water-phase solution containing nano bubbles; step 2, preparing an oil phase solution; step 3, immersing the surface of the separation layer of the porous support membrane in a water-phase solution containing micro-nano bubbles for a certain time, and then removing surface moisture; 4, pouring the oil phase solution on the surface of the separation layer of the porous support membrane, carrying out interface reaction for preset time, blow-drying, and washing the surface of the separation layer of the porous support membrane by using a pure organic solvent; and step 5, carrying out heat treatment on the porous support membrane at a predetermined temperature for a predetermined time, and finally, sufficiently rinsing the dried porous support membrane with pure water or an ethanol solution to obtai