Abstract: The invention discloses a dual-flaw-baffle compound gasoline fractionator of ethylene unit, a quench oil circulation section is provided with micro baffles which are arranged in parallel in the vertical direction at intervals, a vertex angle of the micro baffle ranges from 90 to 139 degrees, symmetrical bevel edges at two sides of the vertex angle of the micro baffle are provided with symmetrical vertical hems, a medium oil circulation section is provided with dual-flow trays which are arranged in the vertical direction and have meshes with the diameter ranging from ?18 to 24 mm, a diesel oil separation section is provided with dual-flow trays which are arranged in the vertical direction and have meshes with the diameter ranging from ?13 to 24 mm, and a gasoline separation section is provided with dual-flow trays which are arranged in the vertical direction and have meshes with the diameter ranging from ?13 to 18 mm.