The invention provides a refining method for cast aluminum lithium alloy with high lithium content. The refining method comprises the following steps that (1), after pure aluminum is melted, primary refining is conducted by using argon rotating injection under the temperature of 810-820 DEG C before refined alloy elements are added; (2) before main alloyed elements are added, secondary refining isconducted by using argon rotating injection under the temperature of 730-740 DEG C; and (3) after the main alloyed elements are added, third refining is conducted by using argon rotating injection under the temperature of 720-730 DEG C. Compared with the prior art, the refining method has the following beneficial effects that the hydrogen content and dregginess of the obtained cast aluminum lithium alloy with high lithium content are greatly reduced, the burn out rate of lithium elements is reduced, the smelting cost is reduced, the mechanical property is improved, and technical supports areprovided for the development and practical application of the cast aluminum lithium alloy with high lithium content.