The invention discloses a method for a vehicle-mounted communication terminal to achieve dial-up internet access. The method comprises the steps of dial-up condition judgment, network state judgment, asynchronous dialing, and dial-up time-out monitoring. An asynchronous call mode is adopted for a dial-up mode, so that a dial-up function returns immediately, the state of dial-up connection is monitored through window messages at the same time, and the problems that when the dial-up function is blocked, the function does not return, and the dial-up function has no response are solved. Meanwhile, according to the method, because network state judgment is carried out before dialing, it is guaranteed that dialing is carried out under the circumstance that network services are normal, it is avoided that dialing is carried out under the circumstance that no network exists, and system loads are reduced.