The invention relates to a sewage purification device which comprises a hybrid reaction device and a tubular solid-liquid separation device. The hybrid reaction device is formed by connecting reaction pipes in series in an identity symbol structure and mounting the reaction pipes on a bracket, wherein a sewage pump is connected to an inlet of the reaction pipe A by a pipeline, an outlet of the reaction pipe C is connected to the tubular solid-liquid separation device by a pipeline, the tubular solid-liquid separation device is in structure shaped like the Chinese character shan, a tubular separation area is formed by the vertical strokes, a water storage area is formed by the bottom horizontal stroke, the outwards extending part of the bottom water storage area is also connected with a vertical drain pipe, a water level control valve is mounted at the upper part of the vertical drain pipe and connected to a waterspout, and the upper part of the tubular separation area is in through connection with a transversal pipe to form a slag outlet. An air-liquid mixing pump is divided into three paths by pipelines and respectively connected to dissolved air water adding points A, B and C at the inlet of the reaction pipe A, the inlet of the reaction pipe C and the outlet of the reaction pipe C by a flowmeter and a valve so that medicaments, original water and dissolved air water are fully mixed and enter the tubular separation area for air-bearing separation, and purified water flows out through the waterspout.