The currently using material loading and unloading system for liquid ammonia treatment equipment of cotton and linen fiber has shortcomings of low efficiency and high labor intensity. In order to get rid of these shortcomings and based on TRIZ theory, the innovative design of complete material delivery system for liquid ammonia treatment equipment was made. The design realized material loading and unloading in small space and long distance by using heart crank gear rack mechanism and solenoids. Type CP1L PLC from Omron was used to control of the entire system, to realize automation of material delivery system for liquid ammonia treatment equipment of cotton and linen fiber.