Anaerobic reactor with compound structure

The utility model relates to an anaerobic reactor used for sewage treatment, which is characterized in that the bottom of the reactor is provided with a water distributing device; the upper part of the water distributing device is provided with a three-phase separator; a stuffing carrier layer is arranged between the water distributing device and the three-phase separator. The anaerobic reactor with the structure can limit the drainage for expansion and floating of a bottom sludge layer, and enhance the degradation capacity of organic matters.