A chaotic synchronization secure communication method based on chaotic maps switch is proposed. The extended chaotic model is first built to generate many kinds of chaotic signals based on changing parameters during different time durations. In the transmitter, the modulation is implemented by adding the information signal to chaotic carriers, taking a modular operation on the sum, and embedding the result of the modular operation in the iteration of the extended chaotic generating systems. In the receiver, the chaotic carriers are retrieved from the received signals by using the corresponding nonlinear dynamical system, and then the information signals are recovered. The simulation results show that this chaotic synchronization secure communication method based on chaotic maps switch has the good immunity to interference and can be realized easily. It is also shown that this chaotic secure communication system is better in security than that based on single chaotic map.