Abstract: Combined with the requirements of the experimental equipment for MCU related course teaching and the characteris-tics of the industrial field control system,according to the working principle and basic structure of the programmable logic control (PLC),this paper designs and develops a material sorting experiment device based on STC 8-bit single-chip microcomputer. The ex-perimental device consists of a central processing unit,analog input/output,and digital input/output units,and it can perform basic material sorting operations. The experimental device not only can meet the experimental and practical teaching requirements of the MCU related courses,but also can better display the working principle of the PLC,enhance the connection between the MCU course teaching and other professional courses,and is conducive to the students' follow-up professional courses. The device meets the teach-ing needs of the course and the engineering practice,and can stimulate students' enthusiasm for learning,and the operation is stable, reliable and easy to operate.