The invention provides socks with one piece not easy to lose. The socks with one piece not easy to lose bring new convenience to people in daily life. The socks with one piece not easy to lose comprises a sock body composed of two pieces and connecting devices, wherein the two pieces can be connected through the connecting devices, and the connecting devices are arranged at opposite positions of the opening sides of the two pieces. The connecting devices are designed skillfully, and easy to buckle together and hard to pull off, namely the connecting devices can be buckled together or separated easily but not fall off easily in a using process. The socks with one piece not easy to lose are simple in structure and low in cost. According to the socks with one piece not easy to lose, overall production cost of existing socks is barely increased, large-scale production can be achieved easily, time for looking for a piece of socks is saved, expense is saved for people, and waste is reduced.