The invention relates to an integrated coaxial recycling serial connection type high-efficiency cyclone separator which is small in size, short in air flow route, small in pressure drop, stable in air flow field, stable in property and high in separation efficiency. The integrated coaxial recycling serial connection type high-efficiency cyclone separator comprises a main shell, an air inlet tube, an exhaust tube and a discharge cabin. The integrated coaxial recycling serial connection type high-efficiency cyclone separator is structurally characterized in that a backflow device is further arranged on the top of the main shell; the backflow device comprises a backflow tube, a backflow volute and an inner cylinder which is connected with the lower end of the backflow volute; the inner cylinder is coaxially arranged with the main shell and the exhaust tube; the air inlet tube is arranged on the main shell below the backflow device; and the air inlet tube is connected with the main shell so as to form an air inlet volute.