The invention relates to a simulation calculation method for the tangent arc height of root curve type unequal-thickness stacked plate springs, belonging to the technical field of a suspension steel plate spring. According to the number of the plate springs, the structure parameters of each plate spring and the design value of a free tangent arc height, the simulation calculation method conducts simulation calculation for the preclamped tangent arc height of the first plate spring of the root curve type unequal-thickness stacked plate springs after a bolt penetrates through the center and is clamped and the assembly clamping tangent arc height of the first plate spring of the root curve type unequal-thickness stacked plate springs after a U-bolt is assembled and clamped. By prototype testing, the simulation calculation method is correct and can obtain accurate and reliable simulation calculation values of the preclamped tangent arc height and the assembly clamping tangent arc height. By using the method, the design level and reliability of a product can be improved, the service life of the product can be prolonged, and the vehicle driving safety can be improved. Meanwhile, the design and testing expenses of the product are reduced, and the rate of development of the product is increased.