The invention relates to an automobile anti-theft system based on GSM network, comprising a central controller (MCU), a car condition testing module, an anti-theft protecting and control module, a local alarm module, a state display module, a voice monitoring and output module, a wireless communication module (GPRS), the wireless communication module is communicated with the central controller through a serial port, the system accesses the GSM/GPRS network by the wireless communication module, realizes report, monitoring and anti-theft control of car states through the short message function. Comparing with the prior art, the automobile anti-theft system of the invention utilizes the GSM short message service to realize data bidirectional transmission, has priority, high completing rate, low error rate, adopts the short message mode to monitor cars, has low communication cost, high spectrum utilization rate, large system capability, good security, strong antijamming capability, good communication quality, automatic roam.