The sorting system is usually used as a load handling system in the industrial applications in order to increase the production rate, reduce human error, and increase the efficiency. There are two types of sorting system applied in the industrial applications such as manual sorting system and automatic sorting system. This project presents the design and implementation of PLC based automatic sorting system in mini scale size. The system consists of a conveyor, limit switch, double acting cylinder, and Programmable Logic Controller. Omron PLC CPM2A was used to control the system based on the height of the box. The resulting box sorting system was capable to separate the height of 4 cm block and the height of 1 cm block into their respective location.