The invention discloses a circular region diving method used for orthodontic wire bending planning, and relates to technical field of orthodontic wire bending. Based on an orthodontic wire curve bending point information set of a patient, a robot motion information set of the bending points and in combination with the motion relation of a robot and orthodontic wires when the robot bends orthodontic wires, the circular region diving method used for orthodontic wire bending planning is built. According to the technical scheme, the method comprises the steps of importing circular region divided data; defining circular region ranges; judging whether or not to continue dividing the orthodontic wire curve according to circular regions; arranging all the circular region ranges in a descending order.