The invention provides a permanent magnet synchronous linear motor feeding system electromechanical coupling modeling method comprising the following steps that 1. the spectrum characteristics of thepermanent magnet synchronous linear motor servo output thrust are analyzed and calculated by using an electromagnetic energy method; 2. a permanent magnet synchronous linear motor feeding system mechanical dynamic model is established by using the Lagrange equation; 3. the mutual coupling effect relationship between the permanent magnet synchronous linear motor feeding system servo driving and mechanical systems is analyzed; and 4. a permanent magnet synchronous linear motor feeding system multifactor coupling electromechanical coupling model is established according to the mutual coupling effect relationship between the servo driving and mechanical systems. The essential law of various coupling problems of the system can be rapidly and effectively analyzed, and the extent of the influenceof various electromechanical coupling on the motion stability of the system can be rapidly and reliably evaluated so that new changes caused by the problem of electromechanical coupling can be further supplemented, and the integrated modeling method of the complex electromechanical system can be improved.