The invention provides an automatic spline finding and press-assembling device for a CV joint of an automobile driving shaft. The automatic spline finding and press-assembling device comprises a press-assembling machine, wherein a press-assembling head is arranged on the press-assembling machine; a CV-joint placement table is arranged below the press-assembling head; a clamping device is arranged on the press-assembling head; a rotating device is arranged at the lower end of the CV-joint placement table; a rotating rod is arranged beside the rotating device; a pushing air cylinder is arranged at the left end of the rotating device; the rotating rod is pushed by the pushing air cylinder, and further the rotating device is driven to rotate left and right; and the rotating device is used for driving the CV joint placement table to rotate. The automatic spline finding and press-assembling device has the beneficial effects that the clamping device on the press-assembling head is used for clamping the driving shaft; the CV-joint placement table is used for placing a spline and rotates left and right through the rotating device arranged at the lower end of the CV-joint placement table so as to facilitate the insertion of the spline, thereby improving the working efficiency of press assembly; a rubber shell blocking plate is arranged and used for blocking a rubber shell on the driving shaft so as to facilitate the opening of the rubber shell when the spline is inserted; a rotation detecting device is arranged to avoid the long-time working of the pushing air cylinder; and the service life of equipment is prolonged.