The invention discloses a high-performance aluminum alloy strip material and a preparation method thereof. The high-performance aluminum alloy strip material is prepared from components in percentageby weight as follows: 0.01%-0.10% of Si, 0.01%-0.30% of Fe, smaller than or equal to 0.05% of Cu, 0.10%-0.30% of Mn, 2.50%-3.50% of Mg, smaller than or equal to 0.01% of Ti, smaller than or equal to 0.05% of Cr, smaller than or equal to 0.008% of V, smaller than or equal to 0.008% of B and the balance of Al and inevitable impurities. The preparation method comprises steps as follows: raw materialssuch as aluminum ingot and the like are subjected to multi-pass refining degassing and multi-stage filtration in smelting and insulating standing processes, and subjected to homogenizing heat treatment after semicontinuous casting, saw cutting and milling; then the raw materials are discharged out of a furnace and subjected to hot rolling, a hot rolled coil material is cleaned and straightened, and the high-performance aluminum alloy strip material is prepared. The aluminum alloy strip material has good welding and deformation performance, is high in ductility and electric conductivity and further has certain strength.