At present, there are few researches on the calculation of packaging input quantity in the automobile industry. Due to many factors affecting packaging input quantity and lack of relevant research, the work aims to make up for the deficiencies of the current research and the industry's general measurement methods by studying the calculation model of shared packaging input quantity in the automobile industry. The work started with the definition and advantages of shared packaging of company Z, made an in-depth analysis on the calculation logic of shared packaging input quantity, and gave the calculation formulas of packaging turnover cycle, empty container preparation quantity of each node and the calculation model of shared packaging input quantity.The model was applied to packaging boxes invested in a new factory of Company Z. The difference rate between the calculated quantity of the model and the actual operation quantity was small. The maximum difference ratio was 7.8%. It avoided the cost wastes of too much packaging input. And in the actual packaging circulation, each type of packaging delivery needs and empty container circulation needs of each supplier are effectively met, and the packaging turnover process works well. The model can be effectively applied to the calculation of the input of shared packaging in the automobile industry.