Shale gas field sewage multiphase separation device

The utility model discloses a shale gas field sewage multiphase separation device. The shale gas field sewage multiphase separation device comprises a first cyclone separator and a second cyclone separator, each cyclone separator comprises a cylindrical vortex section and a concentric diameter shrinkage section which are connected in sequence, each cylindrical vortex section is provided with a feeding port, and the small-diameter end of each concentric diameter shrinkage section is a heavy discharging port; a heavy material outlet of the first cyclone separator is communicated with a material inlet of the second cyclone separator; and the inner diameter of the cylindrical vortex section of the second cyclone separator is greater than that of the cylindrical vortex section of the first cyclone separator. Under the action of static pressure, sewage is subjected to cyclone separation in the first cyclone separator, a light oil phase forms an inner cyclone and rises to be separated out, and heavy-phase water and