A wound-healing insole has a plurality of insole units. Each insole unit has a main body with raised posts on top face and bottom face, respectively. Sleeve bodies are provided at the periphery of the main body. The insole unit and the adjacent unit are connected with each other by plugging raised posts of adjacent unit into the corresponding sleeve bodies thereof. A plurality of insole units is thus assembled into a wound-healing insole. The insole units corresponding to the location of a foot wound can be dismantled to form an opening for relieving load on the wound. The insole units can be assembled or detached at will to form an insole with perfect fit for all foot shapes and sizes, and the opening for the foot wound can also be altered in shape, size and location. Besides, the wound-healing insole is recyclable and is used without any hand tools.