The invention relates to a pavement rolling section length measurement and feedback method and a pavement rolling section length measurement and feedback system based on a GNSS technology, which are designed to acquire a field rolling length value of a bituminous pavement in rolling construction accurately. The pavement rolling section length measurement and feedback method comprises the steps of acquiring coordinates of all machineries in a pavement operating surface dynamically by adopting a positioning technology, converting the coordinates into engineering pile numbers, counting a rolling section length value during the pavement engineering operation in real time by utilizing difference between the maximum and minimum in the engineering pile numbers, and feeding back the rolling section length value to an engineering manager. The pavement rolling section length measurement and feedback method and the pavement rolling section length measurement and feedback system ensure that the rolling is completed within effective time of the bituminous pavement, and guarantee the quality of engineering construction. The adopted acquisition technology, data statistical method and information feedback method are simple and feasible, the economic and social benefits are significant, and the pavement rolling section length measurement and feedback method has high popularization performance.