After production accomplished, paint must to be divided into different capacity products, so as to sale. According to the control requirements of paint packing line, automatic sending barrels, automatic filling and sealing were designed. Siemens FM353 positioning module was used in the servo system. EM277 touch-screen was used as man-ma-chine interface of upper machine, which communicated with lower machine S7-300 through DP. The system runs stably and reliably in the field and reduces labor intensity of the workers.