The invention relates to a self-adaptive water adding method of a steam generator. The method comprises the following steps that S1, water is added into the steam generator for M seconds, and the water level is enabled to be lower than a pre-warning high water level of the steam generator; S2, the steam generator is started to work; S3, the working temperature of the steam generator is detected and obtained in real time, the boiling state temperature D of the steam generator is recorded, and meanwhile, the sum of D + x is set to be the dry burning temperature; S4, whether the steam generator stops working or not is judged, if yes, S7 is performed, and if no, S5 is performed; S5, whether the temperature of the steam generator reaches the dry burning temperature or not is judged, and if yes,S6 is performed; S6, the water is added into the steam generator for M seconds, and the S3 is performed; and S7, the steam generator stops working. The self-adaptive water adding method of the steamgenerator does not need a water level detection device, self-adaptive water adding in the steam generator can be realized, and meanwhile, the situation of excessive water amount in the steam generatorcan be avoided, and the situation of long-time dry burning can be avoided.