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Scanning acoustic microscope is a kind of non-destructive testing imaging equipment using ultrasonic wave as the media. Compared with traditional destructive testing, scanning acoustic microscope will not cause damage to the sample, let alone affect the performance of the sample. This paper mainly introduces the development status, application and development of scanning acoustic microscope. Application fields are mainly from the material science testing industry, semiconductor testing industry, diamond testing industry, low-voltage electrical testing industry and water cooling plate testing industry. Finally, the development of scanning acoustic microscope is prospected. With the development of ultrasonic technology, the frequency of sound will be higher and higher, and the power of ultrasonic microscope will be larger and larger. It can be expected that it will play a bigger and more unique role when combined with other cutting-edge technologies.