The utility model discloses an anchor cavity structure, including the hull of connecting the anchor cave, hawse -pipe and anchor cave intercommunication, the anchor body set up in the anchor cave, andthe anchor cave sets up in the hull outsidely anchor cave planking and anchor cave apron, anchor cave planking indent, cross -section are the < font that has the dog -ear, connect hull planking and planking aggregate all around, the outside anchor cave apron of connecting anchor cave planking one end in a top that covers, form storage space between anchor cave apron and the anchor cave planking,the anchor body sets up among them, and laminating anchor cave apron is accomodate. Can reduce the anchor body and expose the area in external environment, avoid rain, snow influence, and then weakenthe erosion of outside air, rain, snow etc. And the ice influence that low temperature leads to to the better protection anchor body also does benefit to the throwing of boats and ships, the operationof disanchoring.