The present invention discloses a method and a communication terminal for implementing a voice service through a wireless network. The method includes: generating a request for a voice service according to a voice service access code and generating a trigger signal according to the request; setting up a connection with the wireless network according to the trigger signal; performing network registration for the voice service; and processing a call of the voice service through the network connection after the network registration is successful. The technical solution of the present invention overcomes the conflict between Voice over Internet Protocol (VoIP) and dial-on-demand when VoIP traffic is carried over a Packet Switched (PS) network, so that no radio bandwidth is wasted and that the user can use VoIP at any time with no need to modify the network.