Rat urine infection has become a serious problem for people as the worst case from this disease can lead to death for the people. Factor identified was current preventive measures for rat is not efficient and effective. The problem associated with the factor are the current preventive measure involve high intervention of people and this led to the neglection of conducting a proper preventive measure for the rat's problem. By utilizing the knowledge of the current evolving technology, which is now a trend, the author suggests developing an innovative rat's trap that can minimize user intervention and increasing the safeness of the trap to the people. This innovative rat trap is equipped with rat's sound frequency for rat's attraction to enter the cage, rat's killing mechanism and notification functionality. The method used for this development of Smart Rat Trap is Waterfall Methodology. A prototype that describes the functionalities of Smart Rat Trap will be developed by using Internet of Things technology to produce the desired product. © 2021 IEEE.