Abstract: This paper introduced the auxiliary magnetic force based on the bistable piezoelectric cantilever beam in order to improve the voltage output of the bistable piezoelectric cantilever beam. The influence of the auxiliary magnetic force on the complex nonlinear dynamic responses of the bistable piezoelectric cantilever beam was studied. The experiment structure was a symmetric laminated beam.The material of the piezoelectric layer was PVDF,and the material of the basic layer was brass. The excitation of the piezoelectric cantilever beam was the harmonic excitation. The jump phenomenon was studied by the forward sweep frequency and the reverse sweep frequency of the voltage and displacement.The effect of longitudinal auxiliary magnetic force on the chaotic motion of the system was researched.Experimental results showed that when the distance between the auxiliary magnet and the primary magnet is large,the bistable system exhibits obvious hard spring characteristic. When the distance between the auxiliary magnet and the primary magnet is small,the bistable system exhibits obvious soft spring characteristic. In addition,when the distance between the auxiliary magnet and the primary magnet is small,the nonlinear dynamics of the system tends to be rich and complex.