In order to solve the deficiency of accurate analytical dynamic response model for dynamic parameter identification of packaging machinery, this paper presents a new method of parameter identification for packaging pushing mechanism using Lie symmetry analytic model. Firstly, the nonlinear dynamic equation of packaging pushing crank slider mechanism is established; secondly, the analytic mathematical model of crank and slider motion displacements are obtained using Lie symmetric integration method, and then the iterative formulas of parameter identification are obtained by combining Lie symmetry analytical model with recursive least square algorithm. Finally, an example shows that the analytical model values are consistent with the experimental values, and the accuracy of parameter identification is higher, thus the parameters identification using Lie symmetry analytical method can provide important reference for model control and path planning of packaging pushing mechanism.