The invention provides an emergency vehicle signal priority control method. According to the method, the emergency vehicle GPS positioning data is acquired in real time, map matching of the dynamic vehicle position is carried out, shortest vehicle passing path analysis and update and signal intersection locking phase determination are realized, a driving distance between an emergency vehicle and a downstream intersection performing a signal priority task is further estimated, the intersection signal is analyzed to control the phase locking and unlocking opportunity, in-front vehicles are cleared before the emergency vehicle arrives at the intersection, absolute priority passing of the emergency vehicle is realized. Through the method, the emergency vehicle is not required to manually set a specific priority line direction and priority phases along each intersection, absolute priority passing of the signal intersection can be realized, passing efficiency of the emergency vehicle is improved, an information and parameter setting flow before performing the signal priority task is simplified, and influence of signal priority on routine traffic flow operation is further reduced.