Aiming at the problem that large-scale filling equipment can not be used in small and medium-sized batch filling production of small and medium-sized enterprises in our country,a small mobile filling and packaging platform was developed based on PLC.Through the overall scheme design of the filling and packaging platform,the work flow was determined,and the problems such as on-line weighing of filling and servo torque PID control of capping were mainly solved.In terms of system hardware,the pneumatic control principle design and model selection,the electrical control principle design and model selection,PLC model selection,I/O interface distribution and wiring diagram design were carried out.In terms of control system software,in GXWork2 environment,the logic control program and torque closed-loop control design for PLC which was the main controller were carried out,and implemented in Visual Studio 2015.Finally,human-computer interaction was realized through the host computer compiling,and the experimental platform was run and debugged.The experimental results show that the whole verification platform has realized a full automatic process of filling,capping,spraying and testing of an alcohol bottle.The filling error is less than 0.3%,and the efficiency reaches 600~800 bottles /h,which meets the requirements of industrial production.