The present invention provides a chamfering circular turning tool cutting force accurate prediction method considering a cutting edge effect. According to the method, discretization processing is performed on a cutting edge, an undeformed cutting region is divided into two parts, and the undeformed chip thickness of each cutting edge micro element in each cutting region is calculated; the shear force coefficient of each cutting edge micro element is calculated; a cutting edge force coefficient is linearly related to shear stress and chamfering length, the calibration equation of the cutting edge force coefficient linear constant term of a circular turning tool is inferred according to experimental data, and the cutting edge force coefficient is calculated; and the cutting force of each cutting edge micro element is calculated, and integral operation is performed along the cutting edge, so that an overall cutting force is obtained. According to the method of the invention, the cutting edge of the circular turning tool is discretized into the plurality of micro elements; the local parameters of each micro element are analyzed and considered; the cutting edge force of the chamfering edge is considered; the cutting force of each cutting edge micro element is predicted; integral operation is performed along the cutting edge; the overall cutting force can be obtained; and therefore, guidance can be provided for the efficient high-precision machining process control of the circular chamfering turning tool.