The invention discloses a self-repair method of low-pressure concentrator clock. The method is as below: first, the concentrator determines whether the clock is abnormal through a set of logic judgment; if the clock is abnormal, the concentrator according to specific rules selects a number of electric energy meters managed by the concentrator and reads the clock; the error caused by meter reading channel delay and non-synchronization in and reading of the sample meter are eliminated, and the concentrator calculates the most credible value in all sample clock data according to the algorithm; and finally the proofreading of the concentrator clock. The entire clock repair process takes full advantage of inherent power meter and channel resources in a low-voltage transformer area, can conduct self-diagnosis and self-healing, and does not need artificial intervention. Through the method, when the clock is confirmed to be missing or inaccurate, the concentrator can conduct reverse timing by using the read meter clock to realize self-healing of the clock.