Anti-dragging device for ship anchor cable in large tidal range environment and anti-dragging method thereof

The invention provides an anti-dragging device for a ship anchor cable in a large tidal range environment and an anti-dragging method of the anti-dragging device, the anti-dragging device comprises a bottom plate seat, a chain wheel support is welded above the front side of the bottom plate seat, the front end of the chain wheel support is rotatably connected with a guide chain wheel for guiding an anchor chain, and a mooring rope tying angle monitoring assembly is arranged below the front side of the bottom plate seat; the mooring rope tying angle monitoring assembly comprises a first support, a second support and a guide chain cylinder base. The first angle encoder is used for monitoring the deflection angle of the rotating shaft A connected between the second support and the first support, the second angle encoder is used for monitoring the deflection angle of the rotating shaft B connected between the second support and the guide chain barrel base, and then the deflection angles of the anchor chain in the