Three-layer integrated sock

The utility model discloses a three-layer integrated sock, and belongs to the technical field of socks. The sock comprises a sock opening and a sock body, the sock body is of a three-layer composite structure, the three-layer composite structure comprises an inner layer, a middle layer and an outer layer, a plurality of air holes are formed in the outer side of the three-layer composite structure, the three-layer composite structure is arranged on the sock body in a segmented mode from head to tail, and the three-layer composite structure is connected through a binding belt. Due to the fact that the binding belts and the three-layer composite structure are arranged on the sock body at intervals, warm-keeping and cold-resisting effects can be effectively achieved in a low-temperature environment. When the three-layer composite structure comprises the outer layer, the sandwich layer and the inner layer, the outer layer is cold-resistant, the sandwich layer stores heat, and the inner layer is warm-keeping, so th