The present invention provides a production system and method of a gas insulated switchgear and used for the local discharge detection. The system comprises a first inflation source, a first inflationpipeline, a filtering drier and a vacuum pump, a link is increased before the standard air tightness inspection and an inflation program, namely, a dried gas is inflated in a gas box, and then the gas box is vacuumized. According to the present invention, the moisture in the gas box can be removed rapidly, thereby avoiding the influence of the moisture on the local discharge detection. In addition, the main defects causing the local discharge failure are also checked at a gas box internal production assembly link, and a test condition method is improved at a local discharge test link, therebyimproving the passing rate of the local discharge test of the gas insulated switchgear, and being able to analyze the detection results more clearly.