A preparation method for super hydrophilic membranes belongs to the field of membrane technology and comprises the steps of: respectively making polycation and polyanion into membrane casting solution; coating micron particles to form two kinds of micron particle enveloping bodies, of which the surfaces are charged with opposite charges; and coating nano particles to form two kinds of nano particle enveloping bodies, of which the surfaces are charged with opposite charges. The nano particle enveloping bodies, of which the surfaces are charged with positive electricity or negative electricity, are added in micron particle enveloping body solution, of which the surface is charged with negative electricity or positive electricity, so electrical raspberry particle solution, of which the surfaces are charged with positive electricity or negative electricity, are obtained. Substrates are firstly arranged in the micron particle enveloping body solution, of which the surface is charged with positive electricity or negative electricity; and then the substrates are arranged in the electrical raspberry particle solution, of which the surface is charged with opposite charges, the assembling is performed alternately and repeatedly; or the substrates are directly arranged in the raspberry particle solution with two opposite charges to be assembled for a plurality of times alternately and repeatedly, so super hydrophilic membranes are obtained. The preparation method for the super hydrophilic membranes provided in the invention has a simple process and can modulate surface property of membranes flexibly.