The invention relates to an optimization method of an IGBT dead zone time. The optimization method comprises the following steps: (1) adopting an IGBT to be optimized to build a converter; (2) enabling the converter to run at a current set dead zone time to acquire key performance parameters of the converter at the dead zone time; (3) reducing the dead zone time with a step length delta Td, and executing the step (2) in a circulation manner until the key performance parameters of the converter dramatically change; (4) drawing a performance parameter-time curve of each performance parameter, changed along with the dead zone time, acquiring the dead zone time enabling the corresponding performance parameter not to exceed a set threshold as the dead zone time to be selected according to the corresponding performance parameter-time curve; and (5) selecting a maximum value from a plurality of dead zone times to be selected, and keeping a certain allowance as the optimal dead zone time of the IGBT. Compared with the prior art, the optimization method is simple and convenient to implement and can effectively improve the control performance of a converter system on the premise of ensuring safe and reliable running of the converter.