Novel porous ionic liquid cleaning agent and application thereof in membrane cleaning

The invention provides a preparation method of a novel porous ionic liquid cleaning agent, which comprises the following specific preparation steps: (1) preparing cationic saponin by using a cationic free radical initiator: adding 1-5mM of initiator 2, 2 '-azobis-[2-(1, 3-dimethyl-4, 5-dihydro-1H-imidazole-3-onium-2-yl)] propane trifluoromethanesulfonate and 0.5-2M of saponin into water, and stirring to obtain a cationic saponin solution; polymerizing for 12 to 18 hours at the temperature of 30 to 90 DEG C; (2) preparing a citrate anion porous organic cage; and (3) preparing the porous ionic liquid, namely mixing the cationic saponin serving as a cationic terminal with the citrate anion porous organic cage serving as an anion terminal according to a molar ratio of 1: (1-3) to obtain the ionic liquid. The ionic liquid has the effects of removing grease, removing inorganic pollutants, complexing metal ions and dissolving blood pollutants, can be used for cleaning membrane equipment, has a good cleaning effect,