The invention belongs to the technical field of aluminum alloy materials, and particularly relates to a cold-rolled strip for a new energy battery aluminum-plastic film aluminum foil, and a preparingmethod of the cold-rolled strip. An aluminum ingot is subjected to semi-continuous casting after smelting and refining, heat-insulation still standing and refining, multi-pass degassing and multi-stage filtration; the cast ingot is subjected to heat-insulation homogenization heat treatment after being subjected to sawing and face-milling; the cast ingot is taken out of a furnace, subjected to hotrolling, then subjected to cold rolling, cleaning and intermediate annealing; and finally cold rolling is conducted, and a cold-rolled strip blank for the aluminum-plastic film aluminum foil is obtained after edge cutting. The cold-rolled strip has the clean surface and internal texture and has no thick and big mesophase compounds, no pinhole is generated after rolling is conducted till the thickness of the aluminum foil for an aluminum-plastic film reaches 20 to 40 [mu]m, and the use demands of the aluminum-plastic film in the aspects of the barrier property, the cold stamping forming property, puncture resistance, chemical stability and insulativity are met.