The invention provides an engine cylinder top surface milling flutter prediction method based on dynamic meshing tooth number analysis. The engine cylinder top surface milling flutter prediction method based on dynamic meshing tooth number analysis comprises the following steps that a universal dynamic milling force model of a disc milling cutter plane milling process is built according to the dynamic characteristics of the disc milling cutter, and a mathematical relation between the dynamic milling force and the meshing tooth number of the workpiece is obtained; according to the geometrical structure and rigidity characteristics of a cylinder body of a straight-line four-cylinder engine, the model of the engine cylinder body is simplified, three basic assumptions which meet actual requirements are put forward, and follow-up derivation is facilitated; the top surface milling process of the engine cylinder body is divided into a plurality of stages of dynamic meshing tooth numbers to beanalyzed and calculated one by one, a dynamic cutting force model suitable for the milling process of the top surface of the engine cylinder body is obtained; and based on the regenerative flutter theory, frequency response modeling on a machining system is carried out under the action of the dynamic cutting force model, and a flutter stabilization domain lobe graph of the top surface milling process of the engine cylinder body is obtained. According to the engine cylinder top surface milling flutter prediction method based on dynamic meshing tooth number analysis, the machining efficiency isimproved while the machining quality is guaranteed, and the service life of the machine tool and the tool is prolonged.