As a measuring instrument with a long history, the signal generator appeared as early as 1920s. With the continuous development of science and technology, people have higher and higher requirements on signals, and they are required to have the characteristics of accuracy, efficiency and high fidelity.[1] And the waveform signal generated by the new waveform generator can really meet the above requirements, so researching and designing a reasonable digital waveform generator has extremely high scientific research and economic value. As a function signal generator, the waveform generator has excellent performance including optimization and intelligent interaction, and has a positive role in promoting industrial production, scientific research and development. Through continuous optimization and improvement, it will help to enhance the level and strength of China's overall industry and scientific research.[2] This paper studies and designs a digital waveform generator based on AT89C52 single-chip microcomputer. The digital waveform generator can output different types and frequencies of waveforms according to the user pressing different buttons.[3] A total of sine wave, square wave, step wave and These four types of triangle waveforms are displayed on the display. Simulation experiments on the entire system, the results show that the digital waveform generator can output a good quality waveform, it is very simple in waveform conversion and frequency adjustment, and has high stability and high practical value.