The invention discloses a three-phase cyclone separator with a spiral structure and mainly aims at providing a three-phase cyclone separation device compact in structure, small in equipment size and good in separation effect. The three-phase cyclone separator is characterized in that an inner cylinder internally provided with a frustum-like structural body is arranged in an outer cylinder and is kept coaxial with the outer cylinder; the inner diameter of a rotational flow section of the inner cylinder is larger than the inner diameter of a water phase outlet section, and two inner tangential inlets are connected in the tangential direction of the outer wall of the bottom end of the rotational flow section; a plurality of outer spiral structural bodies arranged along the circumference are fixed to the inner wall of the outer cylinder and start to be distributed from the lower ends of the tangential inlets; inner spiral structural bodies are distributed at the inner wall face position of a small cone section of the inner cylinder; and the rotation direction of the outer spiral structural bodies is the same as the rotation direction of the outer cylinder inner liquid flow formed through the tangential inlets, and the rotation direction of the inner spiral structural bodies is reverse to the rotation direction of the outer spiral structural bodies.