The invention provides a high-conductivity heat-resisting aluminum alloy monofilament material and a preparation method thereof. The aluminum alloy monofilament material comprises raw materials in percentage by mass as follows: 0.002%-0.03% of B, 0.02%-0.10% of Sn, 0.018%-0.030% of Zr, 0.001%-0.06% of Si, 0.001%-0.15% of Fe, smaller than or equal to 0.01% of V, Ti, Cr and Mn and the balance of aluminum. The aluminum alloy monofilament material is prepared through smelting, refining, casting, rod making and wire drawing. The conductivity of the prepared heat-resisting aluminum alloy monofilament material is larger than or equal to 61.2% according to IACS (international annealed copper standard), the tensile strength is larger than or equal to 165 MPa, the elongation percentage is larger than 2.0%, the heat-resistance temperature is higher than or equal to 150 DEG C, and the residual strength ratio is larger than 90% after the material is heated for 1 hour at the temperature of 230 DEG C.