The invention relates to the technical field of skin tumor resection supplies, and discloses a dividing device for tumor with pedicle on body surface. The device includes a box body, and the box bodyis provided with a control screen, a power-on interface, a fixed rod 1, a fixed rod 2, a fixed plate 1, a fixed plate 2, a movable cavity, a telescopic motor, a telescopic rod, a connecting rod, a slider hole 1, an extension plate, a strip-shaped hole, a blade and a coagulation plate. The device has a simple structure, a small size, and is easy to use and operate, only requires a medical staff tocomplete the tumor resection process. After the resection, the stump can be hemostatic immediately to save time and effort.