The utility model relates to an improvement of an assembly structure of a racquet stringing machine, which is applied to an electronic racquet stringing machine. The electronic racquet stringing machine comprises a string pulling machine head corresponding to a racquet carrier in displacement, and the string pulling machine head is assembled into a machine station. The machine station mainly comprises a base, a casing and at least one rail, a driving component for driving the location of the string pulling machine head is arranged on the base, a direct motion rail is arranged at the position of the base close to the driving component a slide rail for at least one bearing which drives the string pulling machine head to slide is formed on the rail, after the inner driving component, the string pulling machine head, the bearing and the rail are arranged completely, as a plurality of first locking portions are formed on a preset position of the base while second locking portions corresponding to the first locking portions are formed on the casing too, mounting personnel can utilize the locking portions to effectively and firmly lock the casing to the base so as to form a simple and highly efficient string pulling device, and further, by aid of the structure, the mounting personnel can conveniently assemble the racquet stringing machine while the assembly cost can be effectively reduced.