The invention discloses a personalized position privacy protection method based on road network environment. The method comprises the following steps: 1, initializing a position semantic influence vector of a road section; 2, encapsulating query information Q and sending the same to a anonymous server; 3, adding the road section e in an anonymous set S; and marking the current road section eNow=e; 4, acquiring all adjacent road sections of the eNow, and adding 1 on the road section distance of the eNow of the distance of all adjacent road sections; and adding all adjacent road sections in a candidate set H; 5, the anonymous server calling a distance adjusting module to perform the road section distance adjusting on all road sections in the H; 6, computing the sensitivity of each road section in the H by use of a formula, and selecting the road section et with the lowest sensitivity to add in S, setting eNow=et; 7, the anonymous server calling an anonymous set sensitivity computing module to compute whether S satisfies a user requirement. Through the adoption of the method disclosed by the invention, the attack resistance is strong, the operation is safer, and the considered condition is more suitable for the actual conditions.