Purification method of liquid crystal monomer or liquid crystal composition

The invention relates to a method for purifying a liquid crystal monomer or a liquid crystal composition. A macroporous polyimide polymer is used as an adsorbing material; the liquid crystal monomer or the liquid crystal composition is dissolved in an organic solvent at the temperature of between 15 and 50 DEG C and runs through a pillar adsorbed with the macroporous adsorption polyimide polymerat certain flow speed; after adsorption is completed, the mixture is filtered, an adsorbent and other small solid particles are removed and decompression and distillation are sequentially performed to remove a solvent. With the method, polar impurity contained in liquid crystal is adsorbed to the surface of the polymer, thereby reducing the contents of the polar impurity and ions in the liquid crystal, increasing the impedance value of the liquid crystal composition, improving the charge retention rate (VHR) of the liquid crystal and achieving the aim of improving the displaying effect of a liquid crystal display devic