Taking the vertical retort on a continuous basket-less sterilization production line as the research object, analyzed the cracked retort considering the temperature and water pressure. At the same time, the cracks were set as a random variable and the influence factors on the reliability of the retort were analyzed by the random finite element method. Firstly, the geometric model was built by SolidWorks, then the mechanical properties and reliability were calculated by ANSYS. The results showed that: compared with the water pressure, the temperature had a great influence on the mechanical properties of the retort. To the cracked retort, the crack depths greatly affected the stress and displacement. According to the Latin superposition method in ANSYS, the reliability degree of the retort can reach 96.7%.