The invention relates to the technical field of automatic cleaning devices for wine production equipment, and discloses an automatic cleaning device and a cleaning method thereof. The automatic cleaning device comprises a clear water pot, a hot water pot, an acid pot, an alkali pot, a cleaning fluid pump, a cleaning fluid filter and an electric cabinet, wherein the upper parts of the clear water pot, the hot water pot, the acid pot and the alkali pot are respectively provided with a pneumatic water inlet valve, and water inlets of the pneumatic water inlet valves are respectively communicated with a water inlet pipe with a water inlet hand valve. The automatic cleaning device is reasonable and compact in structure, convenient to use, higher in cleaning efficiency, time-saving, labor-saving, high in equipment cleaning rate, and capable of reducing the influence of harmful aerial fog on the health of operators during cleaning; equipment can be automatically controlled by the electric cabinet to performing clear water flushing, alkali liquor cleaning, acid liquor cleaning and sterilization, acid or alkali can be added by an acid-alkali adding device, and the acid or alkali in the corresponding pots can be evenly mixed by a fluid circulating pipe and the relevant pneumatic valve, and the device has the characteristics of being safe, labor-saving, simple, convenient and efficient.