Mechanical linkage type check valve with adjustable non-return direction

The invention discloses a mechanical linkage type check valve with an adjustable non-return direction. The mechanical linkage type check valve comprises a first valve block and a second valve block, wherein the first valve block and the second valve block are mounted in a face-to-face abutting manner; each of the first valve block and the second valve block comprises a connector; the two connectors are used as an external inlet and an external outlet of the check valve; the first valve block comprises a first valve element; the second valve block comprises a second valve element; and the firstvalve element and the second valve element are provided with flow channels with opposite flow directions. The two valve blocks are used for providing opposite flow channels; and the first valve element and the second valve element are driven by respective lifting actuators to be separated from the inner surface of a valve cavity by a certain distance, so that a flow direction from a first valve ball to a gap between the