This paper proposed the system of automatic cylinder book and gas leakage detection system is proposed in this paper. In this system, the LPG leakage is detected through the sensor and information is sent to the user by Short Message Service (SMS) and simultaneously alerts the customer using a GSM module, while activating the alarm and exhaust fan. The additional advantage of the system is that it continuously monitors the level of the LPG present in the cylinder using weight sensor and automatically books the cylinder using a GSM module. The booking status will be sent to user using GSM from the agency side. A Gas sensor is used to detect dangerous gas leaks in the kitchen or near the gas heater. This unit detects 300 to 5000 ppm of Natural Gas. Ideal to detect dangerous gas leaks in the kitchen. Sensor can be easily configured as an alarm unit. The sensor can also sense LPG and Coal Gas. Ideal sensor is used to detect the presence of a dangerous LPG leak in your car or in a service station, storage tank environment. It provides a cost effective and highly accurate system, which not only detect gas leakage but also alert (Beep) and automatic cylinder booking and send an SMS.GSM module is used which alert the user by sending an SMS In order to provide high accuracy gas sensor MQ-6 has been used The intention of the work is to identify the gas leakage, controlling it and also without any human interface gas booking is done.