Abstract: Abstract: The vegetables packed by plastic trays and fresh-keeping film are getting more and more popular in our life. So the tray-type vegetables preservation machine has became one of hot research areas in the world. During the working process of film sealing for vegetables in the tray, film is cut from three directions and sealed based on self-adhesive property. The complex movements about packing in this type cause that the drive parts of film sealing device are more complicated. It not only makes the manufacturing hard, but also leads to the rising costs. All these disadvantages limit the application and popularization of tray-type vegetables preservation machine. Based on this cutting method, the innovation design of film sealing device was carried out by using the linkage mechanism of roller chute and crank-slider mechanism to simplify the drives and reduce manufacturing cost in this study. As a drive mechanism, crank-slider mechanism was designed by using MATLAB for the optimal transmission performance when it was working. According to the calculation, the key design parameters of crank-slider mechanism were determined as follows: the minimum transmission angle was 42°; the length of crank was 140 mm; the length of connecting rod was 340 mm; the length of connecting rod was 340 mm; the eccentric distance was 109 mm. And the structure parameter of linkage mechanism for roller chute was also designed. Its dynamic characteristics were obtained using the simulation of three-dimensional kinematics of cylinder, transverse cutting bar and longitudinal cutting plate using SolidWorks Motion. When the average speed of cylinder was 90 mm/s, the cutting speed of transverse cutting bar and longitudinal cutting plate were 710 and 310 mm/s, respectively, and work efficiency was up to 50 time/ min. By analyzing the working method of design scheme, transverse cutting bar and swing rod were found to have the lowest intensity. Using the SolidWorks simulation, the most vulnerable part of transverse cutting bar and swing rod was discovered. So, a prototype was fabricated according to the parameters design and simulation result. Based on the prototype, a series of tests were designed and carried out. Fifty tests were conducted. In the test, the plastic trays and rapes were regarded as film sealing object by using PE cling film. By recording each cutting cycle time by stopwatch and calculating its average value, we obtained that the efficiency of the prototype meeting the requirements of any available tray-type vegetables preservation machine was 40 times/min. The simulated velocity of cutting was similar to the measured value. The success rate of cutting was 88% and could be greatly improved if connection between lifting device and film sealing device of tray-type vegetables preservation machine is improved. The maximal testing cutting speed of transverse cutting bar and longitudinal cutting plate were 690 and 290 mm/s, respectively. Therefore, it is obvious that the new design of film sealing device about tray-type vegetables preservation machine is feasible. The study provides useful insights for the related design and has an important significance.