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The application discloses a kind of liquid lithium battery negative pole coating material and preparation method thereof, belong to lithium battery negative pole material technical field.The application uses ethylene tar as raw material, sequentially through filtration, distillation, polymerization, blending process, produce the liquid lithium battery negative pole coating material provided by the application is used for the coating treatment of lithium battery graphite negative pole material, can be fully wetted with graphite negative pole material, bonding;The "core-shell" structure formed after the graphite negative pole material is treated using the liquid coating material, including core and the coating layer coated on the surface of core.Coating layer is firm, stable, and presents uniformity.The liquid lithium battery negative pole coating material is in liquid state at normal temperature, and has good flowability;Coking value is higher;It is easy to store, convenient for transportation and use.