A system for product partial alignment is used for obtaining triangle data forming a moving object and fitting a characteristic element of the moving object; matching the characteristic element of the moving object and a characteristic element of a theory object; primarily locating the moving object according to a central point position of the characteristic element of the moving object and a central point position of the matched characteristic element of the theory object; performing accurate iteration by means of imitating a Newton iteration method and outputting translation rotation matrix of the moving object; and translating and rotating the moving object primarily located due to the translation rotation matrix so that the primarily located moving object is aligned to the theory object. The invention further provides a method for the product partial alignment. According to the method, part of a to-be-detected product can be aligned accurately and rapidly to the theory object.