The invention discloses a high-efficiency flotation technology for high-arsenic high-carbon refractory gold ore. The high-efficiency flotation technology comprises the following steps that 1) a flashfloatation technology is performed; 2), a preferential flotation technology is performed; 3), a branch flotation technology is performed; and 4) a bulk concentrate re-floatation technology is performed. The high-efficiency flotation technology is suitable for the high-arsenic high-carbon refractory gold ore, in particular to the high-arsenic high-carbon micro-fine-grain altered rock type refractory gold ore with the gold grade of 2-3 g/t, the flotation index is stable, the problem that the floatation index of the high-arsenic high-carbon refractory gold ore is relatively low is effectively solved, the grade of the concentrate obtained through the flotation processes can reach 30 g/t or above, the flotation recovery rate can be improved to 85% or above, and the high-efficiency flotation technology has very good economic and social benefits.