A police-emergency system of wireless communication which is to generate a signal by a control circuit of the magnetic card and transmits the signal onto the host server through the wireless communication module of said magnetic card, after the host server receives the signal coming from the magnetic card, it judges if the signal is in conformity with the data in the database by the microprocessor such that the signal will be transmitted onto the police-emergency system of police-citizen connection to notice the policemen arrive on the scene where crime happened.