To solve the problem of safety related to property in the dormitory of undergraduates, an intelligent dormitory alarm system based on GSM module and infrared correlation sensor is proposed in this paper. The system uses STM32 as the main control chip, gathering and judging the signals of sensors placed on many doors of the containers. Once there is abnormality found, alarms are given by sounds and lights, meanwhile the system judges which container is, then sends text message to the owner. The owner can control the processor to defend or not. Experimental results show the accuracy rate of the antitheft alarm system reaches 91%.The function of the system is simple to achieve, the installation is convenient, and the effect that there’s only one host but many people can protect it is realized. The system is not only ensured that there’s no confliction between each other’s antitheft systems in the dorm, but also meet the antitheft demand of the whole dorm.