Abstract: In order to improve security of technique process of automatic filling line of industrial detonator, a design scheme of control system of dosing machine based on PLC was put forward and composition and designs of software and hardware of the system were introduced in details. The system realizes automation of dosing process by controlling motor reversing and has manual and automatic operating ways with flexible switch. Besides, it can real-timely display running status of dosing system on monitoring interface of upper computer and has sound and light alarm function. The testing result showed that the system runs stably and has high reliability, which improves working efficiency of production line and reduces labor intensity.