The work aims to design wrapping machinery used to tighten package films with coiled spring. Wrapping movement was achieved with coiled spring rotation force, so that the output of variable force was realized. Then the force was applied through the mutual transmission between the shaft and the gear. When the coiled spring was moving, certain tension was given to the film; however, such achievable tension could also become the part to apply force on the wrapping of coiled spring. The transmission of the film tightening machinery was achieved through the interaction between each shaft and the corresponding gear of the machinery. With respect to the requirements of corresponding tensions applied based on different film tensions, the film tightening tensions of the same film were different under various transverse tensions. The design of coiled spring film-tightening packaging machine has significant importance for the practices regarding the packaging of goods and buffering properties of the film packaging pieces when the film packaging materials are under different tensions.