Bidirectional swing check valve

The utility model relates to the technical field of check valves, in particular to a bidirectional swing check valve which comprises a valve body (1), a valve clack (2), a rocker (3) and the like, a groove is formed in the side face of the bottom of a valve rod (8), and a connecting block (7) is connected with the valve rod (8) and the rocker (3) and fixed through a connecting block nut (5) and a connecting block bolt (6), so that the rocker rotates along with the valve rod and moves up and down. The valve rod (8) and the valve rod nut (15) are connected through trapezoidal threads to achieve transmission, the hand wheel (17) rotates to drive the valve rod nut (15) to rotate and then drive the valve rod (8) to rotate, the guide nut (22) and the valve rod (8) are connected through threads and placed in a guide groove of the valve cover (9) to limit the displacement distance and direction of the valve rod (8), the valve clack (2) is connected with the rocker (3), and the rocker (3) is connected with the valve r