Safety, environmental protection and energy saving are three main measures of development level of modern automotive technology, where safety is in the first place. With people's living standards improvement, more and more users will choose the higher configuration, safer cars. These promote a high-performance automobile airbag system development. Ignition system is a key component of the airbag. Because of reliability, accuracy and other limitations, the existing airbag ignition system doesn’t work well. In this paper, a high-voltage piezoelectric converter used in car airbag ignition systems is discussed. It is the combination of safety and environmental protection, and improves the reliability and accuracy. The solution includes conversion circuit model of piezoelectric ignition system, frequency characteristics of piezoelectric transducer, quantum-based control technology for optimal efficiency of transformation and a starting control design of automobile airbag ignition system on piezoelectric transformer. The experiment results verify the correctness of design.