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At present, people pay more attention to noise pollution and more sound level meters are sent for inspection. The efficiency of traditional manual verification method is difficult to cope with. Therefore, an automatic verification system of sound level meter based on LabVIEW software platform is proposed to realize the automatic verification of sound level meter. The system is designed according to JJG188-2017“Verification Regulation of Sound Level Meter”，By controlling the standard function signal generator (KeySight 33520B) and program-controlled precision attenuator to generate the checkpoint signal and transmit it to the electrical signal input terminal of the sound level meter. After the sound level meter responds to the response, the test results are returned to the system,this paper introduces the design scheme of the system. Through the experiment, the system can measure the frequency range of sound level meter from 10 Hz to 20 KHz, and the dynamic range of sound pressure level is 110 dB. In practical application, the system can complete the automatic verification of instrument automatic control, data acquisition, data analysis and processing, and verification of original data record, which improves the work efficiency of sound level meter verification, reduces human error, and ensures the accuracy and reliability of verification results.