When the static pressure pump works, its load varies with rotational speed, which leads to the excessive tilt of the support basis when the traditional isolator is used. In light of this problem, the theoretical analysis and numerical calculation methods are used to design a new type of nonlinear variable stiffness isolator with limit according to the actual engineering application and the technical requirements to avoid resonance. Then, the vibration isolation efficiency simulation analysis and theoretical derivation of the isolator is carried out. By the trial production of new isolator, the experiments are conducted. The results show that vibration isolation efficiency of the new isolator is slightly higher than that of the original one. The support foundation of the static pressure pump is almost in the horizontal position, which improves the stability of the system. Furthermore, the horizontal error of the support basis can be ensured by adjusting the limit gap of the vibration isolator, which has practical engineering application value.