Non-return filtering mechanism of flow automatic control device

The utility model discloses a non-return filtering mechanism of a flow automatic control device. The flow automatic control device comprises an adjusting valve and a magneto-electricity flowmeter which comprises a detecting pipeline. The adjusting valve comprises a valve body which is provided with an inlet pipeline. The detecting pipeline and the inlet pipeline are arranged in an input-connecting mode. The non-return filtering mechanism is arranged between the detecting pipeline and the inlet pipeline. The non-return filtering mechanism comprises a single-way valve which is connected in a single direction from the detecting pipeline to the inlet pipeline and a filter element arranged in the liquid inlet end direction of the single-way valve. The non-return filtering mechanism has the advantages that medium impurities are prevented from entering the adjusting valve, so that a grinding wheel of the adjusting valve is protected, and meanwhile the function of backflow resisting is achieved.