NOVELTY - Preparing epoxypropyl ionic liquid and polyether-type macro-ionic liquid comprises (a) mixing epoxy chloropropane with tertiary amine kind compound; reacting; churning; separating resultant; obtaining epoxypropyl ionic liquid chloride; (b) melting it in solvent; adding inorganic salt; ion exchange reaction; churning; still sedimentation; filtering; and drying to obtain epoxypropyl ionic liquid containing anion; (c) melting epoxypropyl ionic liquid in solvent, adding ring-opening polymerizing catalyzer; churning; reacting; separating resultant; and obtaining polyether-type macro-ionic liquid.    USE - The method is useful for preparing epoxypropyl ionic liquid and polyether-type macro-ionic liquid. The polyether-type macro-ionic liquid is useful as electrochemical apparatus material of battery.    ADVANTAGE - The polyether-type macro-ionic liquid has higher conductivity, better compatibility with minor-ionic liquid, inorganic salt, and nicer mechanical property.    DETAILED DESCRIPTION - Preparing epoxypropyl ionic liquid and polyether-type macro-ionic liquid comprises (a) mixing epoxy chloropropane with tertiary amine kind compound with mole ratio of 1:1-2 or 2-1:1; reacting for 2-10 hours at 0-90 degrees C while churning up; adding precipitator into reaction system to separate resultant; eliminating reactant which has not reacted to obtain epoxypropyl ionic liquid chloride of formula (I); (b) melting epoxypropyl ionic liquid chloride in dimethylsulfoxide or dimethylformamide solvent; adding inorganic salt with mole amount 1-2 times of tertiary amine compound; doing ion exchange reaction for 2-24 hours at 20-80 degrees C while churning up; doing still sedimentation; filtering; and drying to obtain epoxypropyl ionic liquid containing anion of formula (II), which is the same as anion of inorganic salt; (c) melting 1-10 g epoxypropyl ionic liquid in dimethylsulfoxide or dimethylformamide solvent, adding ring-opening polymerizing catalyzer according to 0.01-0.5% mole ratio of reactant while churning up; reacting for 2-24 hours at 0-90 degrees C; reducing pressure distilling solvent or adding precipitator into reaction system to separate resultant; and eliminating reactant which has not reacted to obtain polyether-type macro-ionic liquid of formula -(O-CH(CH2-N+-R3-X-)-CH2)n-.