The work aims to improve the control method of rotary weighing filling-oriented capping machine. Based on the research on such existing equipment on the market, a kind of rotary weighing filling equipment was designed with industrial wireless local area network (IWLAN) communication mode instead of electric slip ring. In the meantime, the weighing sensor and weighing module would be separately designed. As for the data transmission of rotary and fixed PLCs, it not only realized the transmission of mass data, but also avoided the interruption of data transmission caused by power failure of electric slip ring. The cost of replacing the weighing units was greatly reduced while the filling precision was ensured. This equipment not only ensures the very high filling precision, but also has higher filling speed. In the actual application, excellent using effects have been achieved.