This project is a prototype of “Touchscreen and Sms based security door locking system” which is accessed by a Touch screen module. The touch Screen module is further interfaced with a microcontroller unit where the password is inputted and compared with the original password stored in its EPROM and will give further instructions accordingly. The design consists of three main functional modules, namely; the Touch screen module, the Micro-controller and the GSM module. The Touch screen module acts as an input device used to access the door via a password or pattern locking system .The Micro-controller unit does all the comparison of the inputted password and accordingly give further instructions. The GSM module works as a transmitting unit, used to send intrusion messages to the user mobile device at the receiving end.