The invention discloses an annunciator coating repairing technique. By the adoption of the annunciator coating repairing technique, an insulating coating with the cracks exceeding the standard or a chipping coating of an annunciator can be repaired, so that the use function of the coating is recovered. The annunciator coating repairing technique comprises the specific steps that firstly, coating residues on the annunciator are removed; secondly, lubricating oil in a shell is removed; thirdly, the annunciator is protected; fourthly, gluing is conducted; and fifthly, finishing and inspection are conducted. The repairing method has been used for repairing test samples and taken part in a test run examination of a factory; after the test run, it is shown through appearance inspection that the coating is free of cracks and chipping faults, the performance of the coating is qualified, the state of the coating is good, and the use requirement of an engine can be met; by the adoption of the repairing method, the cost can be greatly reduced for the factory; the repairing method can also be popularized to be used for repairing other engines; machine parts rotates at a constant speed, and formation of the coating can be effectively guaranteed before solidification. A fixing rod on a clamp is designed to be of a multi-section type, so that repairing of multiple accessories can be achieved at a time, and the production efficiency is multiplied.