Abstract: 【Objective】 This research aims to design and manufacture a new type of automatic stress tolerance tester for tomato fruits. 【Methods】 Different varieties of fresh tomato fruits were used as test materials to carry out pressure test.The manufacturing process of the measuring instrument and the importance of pressure test were analyzed, and different instruments were compared to verify the reliability of the instrument. 【Results】 Shifan 45 and Heinz 3501 had higher quality compared with the other 4 kinds of tomatoes; the pressure tolerance of single fruit will be affected by the fruit type index, single fruit weight, pulp thickness, etc.; the fully automatic pressure tester could accurately record single fruit and the change process of the average pressure resistance value and deformation value, and the fruit showed obvious changes at the moment of rupture, the data was clear and accurate; the average value of the pressure resistance of a variety of fruits could be obtained after one measurement; the hardness and flexibility can be measured; the test range was wide (0-5,000 N) with long test stroke (0-140 mm), and the operating speed was adjustable (0-200 mm/min stepless speed change). 【Conclusion】 The pressure resistance tester manufactured in this study is not affected by the environment, and the data is more accurate, so it can be effectively used to measure the pressure resistance of different varieties of tomatoes and improve the measurement efficiency; What is more, it is simple to operate, economical and practical, and has a wide range of popularization values.