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In view of the high error rate of vector control of asynchronous motor in traditional dual PWM converter, a new vector control system for asynchronous motor is designed. The hardware and software of the system are designed respectively. The hardware architecture, the DSP chip and the programmer are emphatically designed in the hardware architecture diagram. The software workflow is set up according to the designed system hardware. The software is divided into five steps: system initialization, interruption control, PWM signal blockade, alarm protection and data communication, and each work step is elaborated. The experimental results show that the designed system has strong robustness, the control performance is far better than the traditional system, the potential of the market development is great, and it has certain guiding significance for the development of asynchronous motor.