The invention discloses a data reconstructing method for estimating an integrated type isolated circuit breaker defect library. A traditional circuit breaker is compared with all parts of an integrated type isolation circuit breaker, and same parts and different parts are obtained through comparison analysis; for the same parts, defect data in a traditional transformer substation is directly written in the integrated type isolated circuit breaker defect library; for the different parts, the improvement points of the parts of the integrated type isolation circuit breaker are analyzed, and defect data eliminated by improvement is deleted, the rest of defect data is written in the integrated type isolated circuit breaker defect library. Considering the overall improvement advantages of the integrated type isolated circuit breaker, the obtained defect data is optimized, and the integrated type isolated circuit breaker defect library closer to the actual situation is obtained. Through datareconstruction, data deviation is small, the obtained integrated type isolated circuit breaker defect library is closer to the actual situation, and the problem that data of an integrated type isolation circuit breaker is not sufficient is solved.