The invention relates to a parallel road vehicle speed calculation method based on mobile phone signaling big data, and belongs to the field of intelligent traffic. The method comprises the steps thata geographic grid system is constructed according to the highway route and the base station information, and an information table in which the base station and the road grid are matched is constructed; then the mobile network mobile phone signaling data stream is acquired in real time, and data preprocessing is performed; highway user identification is performed; the road segment grid speed is calculated by using the speed calculation method with fusion of distance weighing, and the historical period user data of the road segment are reserved; the parallel road segment interference users areeliminated; and the grid speed is calculated again by using the data after elimination of the interference users. Parallel road interference user elimination is performed by using the idea of difference of the user number of the highway having the parallel road segments and the previous highway road segments and the speed difference between the highway and the parallel roads so that the accuracy of highway average speed estimation can be enhanced.