Anchor chain winding and unwinding high-precision metering device

The invention relates to an anchor chain winding and unwinding high-precision metering device which comprises a winding and unwinding box, mounting shafts are rotationally connected to the inner walls of the middles of the two sides of the winding and unwinding box, a winding disc is fixed to the outer wall of the middle of each mounting shaft in a sleeving mode, an anchor chain is fixedly wound on the outer wall of each winding disc, and a penetrating hole is formed in the center of the outer wall of the bottom of the winding and unwinding box in a penetrating mode. The bottom end of the anchor chain penetrates out of the penetrating-out hole, and a winding and unwinding metering assembly is arranged on the outer wall of one side of the winding and unwinding box. By cooperative arrangement of a retracting and releasing metering assembly and a turn number metering assembly, in the process of lowering an anchor chain, a transmission gear is driven to rotate, an annular guide belt is driven to rotate along a T-