The work aims to solve the problem of difficult identification of risk sources and quantitative analysis in the process of litchi packaging. A method based on Hall three-dimensional space and fuzzy fault tree was proposed to solve risk identification and quantitative analysis problems. The factor sets of litchi packaging including such three dimensions as security incidents, space-time structures (work positions) and accident causes were constructed. The basic set of risk events was obtained through the mapping relation between the matrices and the calculation and analysis. The fault tree model of litchi packaging was established, and the expert questionnaire of basic risk events was evaluated. By using the trapezoidal fuzzy number and the left and right fuzzy sorting method, the expert's judgment language was transformed into the risk probability value. The importance of the probability of occurrence of litchi packaging accidents (0.0409) and the probability of the basic risk events was calculated. The measures such as strengthening the standardization construction and increasing investment in technology to prevent the occurrence of risk accidents were put forward.